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1

WEEDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds reduce potato yield and quality and require management in all cropping systems. Weeds can be best managed using an integrated weed management approach that involves field selection and crop rotation, monitoring and field surveys, sanitation of equipment, and proper integration of cultivation ...

2

Weed control  

Technology Transfer Automated Retrieval System (TEKTRAN)

Uncontrolled weeds in pepper can result in the total loss of the crop, or make harvest not economically feasible. Weed control is a major challenge in conventional and organic production systems. Agricultural weed control costs the U.S. economy more than the cost of insect and disease control comb...

3

Agronomic Weeds.  

ERIC Educational Resources Information Center

This agriculture extension service publication from Pennsylvania State University examines agronomic weed problems and control. Contents include a listing of the characteristics of weeds, a section on herbicides, and a section on the important weeds of agronomic crops in Pennsylvania. The herbicide section discusses systemic herbicides, contact…

Hartwig, Nathan L.

4

WEED RESEARCH  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds present in mint reduce oil yield and quality of mint oil. Several weed species have developed resistance to, or are poorly controlled by herbicides labeled for mint production. Low rates of mesotrione and sulfentrazone were tested for weed control and mint tolerance in field trials. Low rates...

5

Alligator weed  

NSDL National Science Digital Library

Alligator weed is a non-native species of plant in the United States that can damage waterways by clogging them and reducing water flow. Also, it grows in a way that reduces light penetration into the water. Alligator weed is being reduced by a few different insects that were released as biological control agents, such as the alligator weed flea beetle.

Robert H. Mohlenbrock (USDA-NRCS; )

2006-11-12

6

Flowers & Weeds.  

ERIC Educational Resources Information Center

Describes the topics and teaching strategies employed in an Issues in Biology course. Discusses flowers, plant breeding, potatoes and tomatoes, the chocolate tree, weeds, Arabidopis, gene transfers, and plant genes/human genes. Contains 22 references. (JRH)

Flannery, Maura C.

1996-01-01

7

Weed ManagementWeed ManagementWeed ManagementWeed ManagementWeed Management Purdue Extension  

E-print Network

-W Weed Management in Alfalfa Stands Dr. Case R. Medlin Assistant Professor of Weed Science Purdue to seeding. Poast® , Poast Plus® , Pursuit® , and Select® can be applied to actively growing alfalfa® , Poast Plus® , or Selec

Holland, Jeffrey

8

Green Weeding  

ERIC Educational Resources Information Center

Gone are the days of tiptoeing to the dumpsters with boxes of weeded books in tow. Lots of libraries are now taking advantage of the many low-cost services and solutions that promise to help extend the lives of collection discards. Some of these options can be very profitable. Some create goodwill within the local community. Some may seem more…

Penniman, Sarah; McColl, Lisa

2008-01-01

9

Winter Weeds.  

ERIC Educational Resources Information Center

Try to learn all you can about a plant in the winter. As the season changes, you can see what the dried seed pod is like in bloom. You are a convert if you notice a spectacular show of summer wildflowers and wonder what sort of winter weed will result. (Author/CM)

Lindberg, Lois

1981-01-01

10

Weed control without herbicides  

Technology Transfer Automated Retrieval System (TEKTRAN)

Managing weeds without herbicides is challenging and requires an integration of tactics and a change in how weeds problems are approached. Weeds should be managed in a holistic, intentional and proactive manner. Growers that successfully manage weeds in organic systems examine why certain weed speci...

11

Modelling weed emergence patterns  

Microsoft Academic Search

Anticipating weed pressure may be important in selecting and timing weed control measures in order to optimize their effectiveness, and thus reduce herbicide use. Therefore, a predictive model of the time of emergence and the numbers of seedling emerging (the weed emergence pattern) after soil cultivation may be a useful tool in integrated weed management. In this study, a simulation

L. M. Vleeshouwers

1997-01-01

12

Weed Identification Websites University of Florida Weed Science: http://weedext.ifas.ufl.edu/  

E-print Network

Weed Identification Websites · University of Florida Weed Science: http University Weed Science: http://www.weeds.iastate.edu/weedid/weedid.htm · Rutgers University New Jersey Weed Gallery: http://njaes.rutgers.edu/weeds · Virginia Tech Weed Identification Guide: http

Jawitz, James W.

13

DEVELOPING WEED MANAGEMENT STRATEGIES THAT ADDRESS WEED SPECIES SHIFTS AND HERBICIDE RESISTANT WEEDS  

E-print Network

DEVELOPING WEED MANAGEMENT STRATEGIES THAT ADDRESS WEED SPECIES SHIFTS AND HERBICIDE RESISTANT Minnesota's major corn and soybean weed management problems. Herbicide Resistant Weeds: Weeds herbicide programs. Weeds with a diverse genetic background may have a resistant biotype that has a 1 in 1

Minnesota, University of

14

Weed Management Costs, Weed Best Management Practices, and The Roundup Ready Weed Management Program  

E-print Network

Weed Management Costs, Weed Best Management Practices, and The Roundup Ready® Weed Management-commercial purposes by any means, provide that this copyright notice appears on all such copies. #12;1 Weed Management Costs, Weed Best Management Practices, and The Roundup Ready® Weed Management Program T.M. Hurley

Mitchell, Paul D.

15

Eradication of Major Weeds  

ERIC Educational Resources Information Center

Strategies for weed control in cropped and non-cropped areas are presented together with an operational plan for implementing a program for weed control at the national level. The program includes training personnel and community education procedures. (EC)

Indian Journal of Adult Education, 1975

1975-01-01

16

MINT WEED RESEARCH  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds lower mint oil yield and quality and weed control represents a major production cost and investment of time for producers of mint oil. The goal of this research is to develop improved weed control methods in spearmint and peppermint and to identify promising new herbicides on spearmint and pe...

17

Weed Biotypes Weed Management in Grain  

E-print Network

Weed Biotypes Weed Management in Grain Sorghum--New for 2012 Huskie Herbicide #12;2012 Sorghum similar or same as Buctril (bromoxynil) Buctril is already labeled in grain sorghum Numerous tank mix options, but for grain sorghum the key is atrazine: 0.25-1.0 lbs. atrazine per acre to strengthen

Behmer, Spencer T.

18

Introduction to Weeds and Herbicides.  

ERIC Educational Resources Information Center

This agriculture extension service publication from Pennsylvania State University is an introduction to weed control and herbicide use. An initial discussion of the characteristics of weeds includes scientific naming, weed competition with crops, weed dispersal and dormancy, and conditions affecting weed seed germination. The main body of the…

Hartwig, Nathan L.

19

Invasive Weed Outreach in Earl Creech  

E-print Network

1 Invasive Weed Outreach in Nevada Earl Creech Extension Weed Specialist Cache Valley, Utah at Purdue What does the Extension Weed Specialist do? Control Nevada's weeds What does the Extension Weed Specialist do? Control Nevada's weeds Enforce weed control laws What does the Extension Weed Specialist do

Nowak, Robert S.

20

Mustard meal weed control  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in organic production systems can be a labor intensive and expensive process. Mustard meal (MM) is phytotoxic and a potential pre-emergent and preplant-incorporated organic herbicide for controlling germinating and emerging weed seedlings. Unfortunately, MM may also adversely impact s...

21

Weed Research in Mint  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds present in peppermint and spearmint reduce mint oil yield and quality. Mustard seed meal applied at 1 and 2 ton/acre to newly planted peppermint reduced annual weed emergence for several weeks without injuring peppermint. Field pennycress seed meal applied at similar rates did not suppress wee...

22

WEED RESEARCH IN MINT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Uncontrolled weeds in peppermint and spearmint reduce mint oil yield and quality. Several weed species have developed resistance to, or are poorly controlled by herbicides labeled for mint production. Flucarbazone, and propoxycarbazone applied to dormant native spearmint caused little or no crop inj...

23

Bioherbicides for Weed Control  

Technology Transfer Automated Retrieval System (TEKTRAN)

Following the first commercially successfully biological control of weeds with fungal pathogens a model for a good bioherbicide was developed. It was assumed that a good agent was one that could be grown cheaply and quickly; was aggressive and patentable; could be easily applied; had single-weed sp...

24

Weeds on the Web  

NSDL National Science Digital Library

The Wildland Invasive Species Program of The Nature Conservancy (TNC) hosts this interesting and light-hearted page on the invasive plants currently threatening the biodiversity of wild lands in the US. Appropriate for undergraduates, educators will find much here on weeds (what they are, which ones are worst), weed control methods, and suggestions for including action in lesson plans. For starters, click on any state in the US map to find out about the worst invasive plants in that state. Those seeking detailed information should consult the Element Stewardship Abstracts, which describe over 100 species in terms of Scientific and Common Name, Description of Characteristics, Biology/ Ecology, Global Range, Stewardship Profile, Threats Posed by this Species, Biological Control, Research Needs, and more. Also at the site are lists of effective weed tools, weeds in the news, and links to weed-related events.

25

Intercropping leeks to suppress weeds  

Microsoft Academic Search

Many field vegetables such as leek are weak competitors against weeds, causing high costs for weed management practice. Using celery as a companion cash crop was suggested to improve the weed suppression of leek. Three field experiments were carried out to study the intra- and interspecific competition in a leek:celery intercrop with and without additional weed competition. Results from this

D. T. Baumann; M. J. Kropff; L. Bastiaans

2000-01-01

26

SUGGESTIONS FOR WEED CONTROL IN  

E-print Network

B-5038 10-98 SUGGESTIONS FOR WEED CONTROL IN PASTURES AND FORAGES Texas Agricultural Extension;4 Suggestions for Weed Control in Pastures and Forages Dr. Paul A. Baumann, Extension Weed Specialist Dr. David as a guide for controlling weeds in pasture and forages. Labeled rates and restrictions change constantly

Mukhtar, Saqib

27

AQUATIC WEED CONTROL SPRING 2013  

E-print Network

PLS 4613 AQUATIC WEED CONTROL SPRING 2013 CREDITS: 3.0 DESCRIPTION: Identification of Florida's aquatic weed problems and methods of chemical, biological, mechanical and physical weed control. Specific, insect biocontrol, grass carp, and current laws regulating aquatic weed control. INSTRUCTOR: William T

Watson, Craig A.

28

Tolerance of Crops and Susceptibility of Weeds  

E-print Network

Guide to Tolerance of Crops and Susceptibility of Weeds to Herbicides Bernard Zandstra and Michael . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 List of Weeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Weed Control Ratings for each Herbicide

29

Modelling weed emergence patterns in arable weeds  

Microsoft Academic Search

A model was developed to simulate weed emergence patterns after soil cultivation. In the model, the consecutive processes of dormancy release, germination and pre-emergence growth were modelled in separate modules. Input variables of the model were: date of soil cultivation, soil temperature and soil penetration resistance. Output variables of the model were: seedling density and timing of seedling emergence. The

L. M. Vleeshouwers; M. J. Kropff

2000-01-01

30

Genomics for Weed Science  

PubMed Central

Numerous genomic-based studies have provided insight to the physiological and evolutionary processes involved in developmental and environmental processes of model plants such as arabidopsis and rice. However, far fewer efforts have been attempted to use genomic resources to study physiological and evolutionary processes of weedy plants. Genomics-based tools such as extensive EST databases and microarrays have been developed for a limited number of weedy species, although application of information and resources developed for model plants and crops are possible and have been exploited. These tools have just begun to provide insights into the response of these weeds to herbivore and pathogen attack, survival of extreme environmental conditions, and interaction with crops. The potential of these tools to illuminate mechanisms controlling the traits that allow weeds to invade novel habitats, survive extreme environments, and that make weeds difficult to eradicate have potential for both improving crops and developing novel methods to control weeds. PMID:20808523

Horvath, David

2010-01-01

31

Weed Problems and Weed Control in the Commonwealth Caribbean  

Microsoft Academic Search

The effect of weeds on crops is discussed, with particular reference to the Commonwealth Caribbean. The most serious weeds in the region are Cyperus rotundas, Cynodon dactylon, Commelina spp., Parthenium hysterophorus, Portulaca oleracea, Cleome spp. and Amaranthus spp. Serious weeds include Eleusine indica, Echinochloa colonum, Euphorbia spp., Brachiaria mutica, Paspalum conjugatum, Sporobolus indicus and Ipomoea tiliaceae. Brief notes are given

J. L. Hammerton

1981-01-01

32

Scottish Government funded weed research  

Microsoft Academic Search

Government-funded research on weeds in Scotland is part of a broad approach to optimise several functions of the arable ecosystem, including those of food security and resilience to economic and environmental change. Weeds are both an economic burden and the base of an essential food web. The approximately 300 species of infield weed that persist in field soils provide ecological

PIETRO IANNETTA; GEOFF SQUIRE

33

Weeds and Fire  

NSDL National Science Digital Library

Students will locate some weed and native species found in Oregon and will understand that while databases are beneficial in studying plant populations, local on-the-ground information is commonly more up-to-date and that both are required to make large scale management decisions. Students will learn that the invasion of weeds commonly follows on the heels of a disturbance (natural or otherwise) and be introduced to some of the factors that impact the success of weeds in a particular ecosystem. Students will begin to relate the data to real-life situations and how they could be used to create management plans/strategies and/or alter existing management practices. This resource includes both a teaching guide and student worksheets.

Kenna, Sean

34

Controlling Landscape Weeds.  

ERIC Educational Resources Information Center

This agriculture extension service publication from Pennsylvania State University discusses the control of common grass and broadleaf weeds through the use of mulches and herbicides. The section on mulches discusses the different types of mulching materials, their advantages and disadvantages, herbicide-mulch combinations, and lists source of…

Nuss, James Robert, Jr.

35

Weed Management -The Basics  

E-print Network

/3 of the seedbank turns over annually #12;William Beal Buried Seed Study · Botanist at Michigan State University (Then Michigan Agricultural College) · Buried seeds in 1879 - 20 glass bottles - 50 seeds of each of 20Weed Management - The Basics Anthony Cortilet Minnesota Department of Agriculture Roger Becker

Minnesota, University of

36

WEEDING IN TRANSGENES  

Technology Transfer Automated Retrieval System (TEKTRAN)

Transgenes promise to reduce insecticide and fungicide use, but relatively little has been done to significantly reduce herbicide use through genetic engineering. Three strategies for transgene utilization are discussed which have the potential to change this: 1) improvement of weed-specific biocon...

37

Kudzu: Misunderstood Weed  

NSDL National Science Digital Library

In this guided inquiry unit, learn more about kudzu as an invasive species and misunderstood weed, analyze photos of the plant, and make a plan to remove it from an infested area. The unit was developed and tested by The Science House, the mathematics and science learning outreach project of North Carolina State University.

38

2009 Annual Weed Research  

E-print Network

Burndown ­ Winfield Solutions 1 104L-09 Sharpen - Adjuvants 3 109L-09 Kixor ­ Grain Sorghum - Burndown 6 111L-09 Kixor ­ Grain Sorghum ­ Weed Control - II 10 112L-09 Kixor ­ Grain Sorghum ­ Tolerance ­ II 13 ­ ALS Sorghum 35 133L-09 Herbicide Comparison Study in Peanut 37 134L-09 Dupont ­ ALS Sorghum 42 136L-09

Mukhtar, Saqib

39

Weed Identification and Control in Vegetable Crops.  

ERIC Educational Resources Information Center

This agriculture extension service publication from Pennsylvania State University examines weed control and identification in vegetable crops. Contents include: (1) Types of weeds; (2) Reducing losses caused by weeds, general control methods and home garden weed control; (3) How herbicides are used; (4) Specific weeds in vegetable plantings; and…

Ferretti, Peter A., Comp.

40

EXOTIC AND INVASIVE HERBACEOUS RANGE WEEDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Resource managers are often discouraged when it comes to the identification of herbaceous rangeland weeds, terminology associated with these weeds, control of these weeds, and the succession of these weeds. The terminology often used in describing herbaceous rangeland weeds (i. e. invasive) often m...

41

Seasonal Weed Control for Northeast Florida  

E-print Network

1 Seasonal Weed Control for Northeast Florida #12;2 Introduction Weed control is a constant battle things you can do to reduce the economic impact of weeds. A healthy pasture has fewer weed problems. Soil to maintain a weed free pasture. Always use certi- fied seed to establish pastures and hay fields. Clean

Jawitz, James W.

42

558 Weed Science 54, MayJune 2006 Weed Science, 54:558565. 2006  

E-print Network

558 · Weed Science 54, May­June 2006 Weed Science, 54:558­565. 2006 Symposium When does it make sense to target the weed seed bank? Adam S. Davis Corresponding author: USDA-ARS Invasive Weeds Management Unit, Urbana, IL 61801; asdavis1@uiuc.edu Weed seeds initiate most weed invasions of arable fields

Sims, Gerald K.

43

PRINCIPLES OF WEED SCIENCE -PLS 4601c INTEGRATED WEED MANAGEMENT PLS 5632c  

E-print Network

1 PRINCIPLES OF WEED SCIENCE - PLS 4601c INTEGRATED WEED MANAGEMENT ­ PLS 5632c Department Description: An introduction to the principles of weed science. Lecture topics will include: weed biology and ecology, an introduction to weed management techniques and methodologies, factors affecting weed control

Watson, Craig A.

44

7 CFR 201.15 - Weed seeds.  

Code of Federal Regulations, 2011 CFR

... 3 2011-01-01 2011-01-01 false Weed seeds. 201.15 Section 201.15 Agriculture...REGULATIONS Labeling Agricultural Seeds § 201.15 Weed seeds. The percentage of weed seeds shall include seeds of plants...

2011-01-01

45

7 CFR 201.15 - Weed seeds.  

Code of Federal Regulations, 2014 CFR

... 3 2014-01-01 2014-01-01 false Weed seeds. 201.15 Section 201.15 Agriculture...REGULATIONS Labeling Agricultural Seeds § 201.15 Weed seeds. The percentage of weed seeds shall include seeds of plants...

2014-01-01

46

7 CFR 201.15 - Weed seeds.  

Code of Federal Regulations, 2012 CFR

... 3 2012-01-01 2012-01-01 false Weed seeds. 201.15 Section 201.15 Agriculture...REGULATIONS Labeling Agricultural Seeds § 201.15 Weed seeds. The percentage of weed seeds shall include seeds of plants...

2012-01-01

47

7 CFR 201.15 - Weed seeds.  

Code of Federal Regulations, 2010 CFR

... 3 2010-01-01 2010-01-01 false Weed seeds. 201.15 Section 201.15 Agriculture...REGULATIONS Labeling Agricultural Seeds § 201.15 Weed seeds. The percentage of weed seeds shall include seeds of plants...

2010-01-01

48

7 CFR 201.15 - Weed seeds.  

Code of Federal Regulations, 2013 CFR

... 3 2013-01-01 2013-01-01 false Weed seeds. 201.15 Section 201.15 Agriculture...REGULATIONS Labeling Agricultural Seeds § 201.15 Weed seeds. The percentage of weed seeds shall include seeds of plants...

2013-01-01

49

Soil, Weeds, and Computers  

NSDL National Science Digital Library

After a 2001 wildfire in the state of Wyoming, scientists were interested in learning what hydrophobic layers existed in the heavily burned areas and at what depth. In a collaborative, inquiry-based project, high school students collected soil chemistry data that helped biologists learn more about controlling noxious weed invasion. As a result of this collaboration, students became part of the process of science and members of the scientific community.

Nate McClennen

2004-05-01

50

Invasive Weed Management Is Site-Specific Weed Management.  

Technology Transfer Automated Retrieval System (TEKTRAN)

Site-specific weed management in crops and invasive weed management in natural lands and rangelands appear to be unrelated research areas but there are many connections in the research problems, approaches and solutions. An obvious link is technology. The technology of precision agriculture - GPS, ...

51

Parasitic Weeds, a Scientific Challenge  

Technology Transfer Automated Retrieval System (TEKTRAN)

A recent issue of the SCI journal Pest Management Science (May, 2009) was devoted to an overview of the problem of parasitic weeds and to the research that is being done to alleviate it. These papers are from an OECD-sponsored conference entitled Managing Parasitic Weeds that recently brought the b...

52

Weed Control Recommendations in Wheat  

E-print Network

-Resistant Weeds ..........................................6 Tables and Figures Figure 1. Feekes scale for the growth and development of cereals ........7 Table 1. Preplant herbicides .........................................................8 Table 2. Preemergence... herbicides ..................................................15 Table 6. Herbicide restrictions and mode of action .........................16 Table 7. Herbicide efficacy for grasses and weeds ...........................19 Figure 2. Boom sprayer calibration...

Morgan, Gaylon; Baumann, Paul A.; Baughman, Todd; Bean, Brent W.

2008-06-05

53

Assistant Professor Agronomy (Weed Science)  

E-print Network

Ramon Leon Assistant Professor Agronomy (Weed Science) Research Focus Dr. Leon has a 60% research and 40% extension appointment in the Agronomy Department at the University of Florida. The goal of his · B.S. University of Costa Rica Agronomy. 2000 Employment · Assistant Professor, Weed Science, West

Watson, Craig A.

54

Organic weed control in watermelons  

Technology Transfer Automated Retrieval System (TEKTRAN)

Integrated pest management (IPM) is an essential element for certified organic crop production and producers place weed control as their highest research priority within their IPM programs. The objective of these experiments was to investigate the impact of integrated organic weed control systems o...

55

Weed Identification Field Training Demonstrations.  

ERIC Educational Resources Information Center

Reviews efforts undertaken in weed identification field training sessions for agriprofessionals in South Carolina. Data over a four year period (1980-1983) revealed that participants showed significant improvement in their ability to identify weeds. Reaffirms the value of the field demonstration technique. (ML)

Murdock, Edward C.; And Others

1986-01-01

56

Davis et al.: Weed seed mortality 291 Weed Science, 54:291297. 2006  

E-print Network

Davis et al.: Weed seed mortality · 291 Weed Science, 54:291­297. 2006 Weed seed mortality in soils Sciences, Michigan State University, East Lansing, MI 48824. Current address: USDA-ARS Invasive Weeds the devel- opment of soil microbial communities that accelerate weed seed mortality. We ex- amined soil

Sims, Gerald K.

57

62 Weed Science 53, JanuaryFebruary 2005 Weed Science, 53:6268. 2005  

E-print Network

62 · Weed Science 53, January­February 2005 Weed Science, 53:62­68. 2005 Duration of volunteer States Department of Agriculture­Agricultural Research Service, Invasive Weed Management Research research with annual weed species indicates that critical timing of weed removal begins primarily after

Sims, Gerald K.

58

Weed to Wonder  

NSDL National Science Digital Library

Human ingenuity never ceases! This wonderful website from the Cold Spring Harbor Laboratory tells the story of how a common Mexican weed (teosinte) was slowly manipulated by humans until it transformed into corn. As an introduction, users might want to start by watching a 2 minute and 50 second video of maize plants growing at Cold Spring Harbor Laboratory. After that, it's a good idea to look over the six separate sections here, which include Domestication, Hybrid Vigor, Genome Sequencing, and Jumping Genes. Each area contains explanatory text, photos, primary documents, and thoughtful explanations of complex scientific ideas.

2012-01-01

59

FIELD CROPS 2012 Weeds: Corn 5-53  

E-print Network

FIELD CROPS 2012 Weeds: Corn 5-53 Corn Uncontrolled weeds continue to be a major limiting factor in Delmarva corn production. To be successful in controlling weeds in corn, the weed control program must- cessful weed control program in corn are summarized below. Weed Control Program Weed identification

Liskiewicz, Maciej

60

Managing weeds in potato rotations without herbicides  

Technology Transfer Automated Retrieval System (TEKTRAN)

Managing weeds without herbicides requires an integration of methods and strategies and a change in how weeds are perceived. Weeds should be managed in a holistic, intentional and proactive manner. Successful weed management in organic systems attempts to understand the interactions between the crop...

61

Annual Weeds, Alternative Crops for Alternative Fuel  

Technology Transfer Automated Retrieval System (TEKTRAN)

All cropland acreage in Alabama is infested with one or more species of annual weeds. Weeds are estimated to cost producers in the state approximately 8% of their potential yield, even with the current weed control technology available. Weed management continues to be the most expensive row crop pr...

62

Applicator Training Manual for: Aquatic Weed Control.  

ERIC Educational Resources Information Center

The aquatic weeds discussed in this manual include algae, floating weeds, emersed weeds, and submerged weeds. Specific requirements for pesticide application are given for static water, limited flow, and moving water situations. Secondary effects of improper application rates and faulty application are described. Finally, techniques of limited…

Herron, James W.

63

WEED EMERGENCE PATTERNS IN THE COASTAL PLAIN  

Technology Transfer Automated Retrieval System (TEKTRAN)

The ability of a weed to interfere with crop growth is a function of the competitive ability of the weed and its emergence time relative to the crop. Knowledge of weed emergence patterns may help optimize crop production and weed management systems. Seeds of coffee senna (Cassia occidentalis), Flo...

64

A SYSTEMATIC APPROACH TO PERENNIAL WEED MANAGEMENT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Perennial weeds are prominent in croplands of Ukraine. Scientists in the United States have explored various control tactics to control perennial weeds. This paper describes the basic ecology of perennial weeds, then outlines possible management systems for three prominent perennial weeds. A key...

65

INTEGRATED WEED MANAGEMENT IN VEGETABLE CROPS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds are present in all annual cropping systems. Most problem weeds in cultivated cropping systems are introduced species that are favored by certain production practices used to grow the crop. Integration of different weed control methods is important to prevent individual weed species from beco...

66

7 CFR 201.50 - Weed seed.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Weed seed. 201.50 Section 201.50 ...Administration of the Act § 201.50 Weed seed. Seeds (including bulblets or tubers) of plants shall be considered weed seeds when recognized as weed...

2013-01-01

67

7 CFR 201.50 - Weed seed.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 2011-01-01 false Weed seed. 201.50 Section 201.50 ...Administration of the Act § 201.50 Weed seed. Seeds (including bulblets or tubers) of plants shall be considered weed seeds when recognized as weed...

2011-01-01

68

Weeding the School Library Media Collection.  

ERIC Educational Resources Information Center

This document prepared by Calgary Board of Education, Calgary, Alberta, Canada, discusses a systematic approach to strengthening the library media collection. A statement of principle, what to weed, specific guides to weeding (by Dewey Decimal classification and type of material), what not to weed, procedures, and weeding follow-up are…

School Library Media Quarterly, 1984

1984-01-01

69

Home Orchard Weed Control By Paul Vossen  

E-print Network

Home Orchard Weed Control By Paul Vossen As I visit home orchardist's back yard trees one of the most frequent problems I see is excessive weed competition. I see many trees that do not have adequate weed control to a point where the weeds have hindered the growth of the young trees. We have extensive

California at Davis, University of

70

7 CFR 201.50 - Weed seed.  

Code of Federal Regulations, 2014 CFR

...2014-01-01 2014-01-01 false Weed seed. 201.50 Section 201.50 ...Administration of the Act § 201.50 Weed seed. Seeds (including bulblets or tubers) of plants shall be considered weed seeds when recognized as weed...

2014-01-01

71

7 CFR 201.50 - Weed seed.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 2012-01-01 false Weed seed. 201.50 Section 201.50 ...Administration of the Act § 201.50 Weed seed. Seeds (including bulblets or tubers) of plants shall be considered weed seeds when recognized as weed...

2012-01-01

72

Can Global Weed Assemblages Be Used to Predict Future Weeds?  

PubMed Central

Predicting which plant taxa are more likely to become weeds in a region presents significant challenges to both researchers and government agencies. Often it is done in a qualitative or semi-quantitative way. In this study, we explored the potential of using the quantitative self-organising map (SOM) approach to analyse global weed assemblages and estimate likelihoods of plant taxa becoming weeds before and after they have been moved to a new region. The SOM approach examines plant taxa associations by analysing where a taxon is recorded as a weed and what other taxa are recorded as weeds in those regions. The dataset analysed was extracted from a pre-existing, extensive worldwide database of plant taxa recorded as weeds or other related status and, following reformatting, included 187 regions and 6690 plant taxa. To assess the value of the SOM approach we selected Australia as a case study. We found that the key and most important limitation in using such analytical approach lies with the dataset used. The classification of a taxon as a weed in the literature is not often based on actual data that document the economic, environmental and/or social impact of the taxon, but mostly based on human perceptions that the taxon is troublesome or simply not wanted in a particular situation. The adoption of consistent and objective criteria that incorporate a standardized approach for impact assessment of plant taxa will be necessary to develop a new global database suitable to make predictions regarding weediness using methods like SOM. It may however, be more realistic to opt for a classification system that focuses on the invasive characteristics of plant taxa without any inference to impacts, which to be defined would require some level of research to avoid bias from human perceptions and value systems. PMID:23393591

Morin, Louise; Paini, Dean R.; Randall, Roderick P.

2013-01-01

73

HORTICULTURAL & FOREST CROPS 2014 Nursery Crops: Weeds 4-41  

E-print Network

HORTICULTURAL & FOREST CROPS 2014 Nursery Crops: Weeds 4-41 Weeds Jeffrey F. Derr, Extension Weed of a given herbicide must be based on the particular weed and crop situation. None of the preemergent. This results in a shift in weed population and eventually weed control with that product becomes ineffective

Liskiewicz, Maciej

74

Using Stochastic Effciency Analysis To Factor Distribution Of Weed Escapes Into Weed Management Decisions  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds in patches may be more easily managed than the same number of weeds spread throughout the field. We explored choosing weed management strategies based on both net return and the distribution of weed escapes within a field. Expected net returns with several different postemergence herbicides of...

75

Weed Emergence Patterns and the Effect of Time of Weed Removal, with  

E-print Network

Weed Emergence Patterns and the Effect of Time of Weed Removal, with Glyphosate, on Corn and Soybean Yield · In 2004 - 2006, research compared weed removal at 5 glyphosate timings (1", 3", 5", 7" and 9" weed heights), with and without a ½-rate of a PRE herbicide, on crop yield and economic returns

Minnesota, University of

76

838 Weed Science 54, SeptemberOctober 2006 Weed Science, 54:838846. 2006  

E-print Network

838 · Weed Science 54, September­October 2006 Weed Science, 54:838­846. 2006 Modeling site the landscape and may facilitate better timing of weed control where residue is present. Emergence of wild oat to improving prediction of weed seedling emergence. Nomenclature: Wild oat, Avena fatua L., AVEFA; winter wheat

Zhang, Hao

77

930 Weed Science 51, NovemberDecember 2003 Weed Science, 51:930939. 2003  

E-print Network

930 · Weed Science 51, November­December 2003 Weed Science, 51:930­939. 2003 Cropping system Department of Agronomy, Iowa State University, Ames, IA 50011 Cropping system characteristics affect weed management by altering key demograph- ic rates of weeds, including recruitment, seedling survival, fecundity

Sims, Gerald K.

78

www.btny.purdue.edu/weedscience/ Noxious and Invasive Weeds and The Weed  

E-print Network

www.btny.purdue.edu/weedscience/ Noxious and Invasive Weeds and The Weed Laws in Indiana Many of us have heard the terms `noxious' and `invasive' weeds or plants. However, I would suspect weeds in these groups. If you would like to read the Indiana Code yourself or you have trouble sleeping

79

860 Weed Science 53, NovemberDecember 2005 Weed Science, 53:860868. 2005  

E-print Network

860 · Weed Science 53, November­December 2005 Weed Science, 53:860­868. 2005 Environmental factors affecting seed persistence of annual weeds across the U.S. corn belt Adam S. Davis1 John Cardina2 Frank State University, East Lansing, MI 48824; Current address: USDA-ARS Invasive Weed Management Unit

Sims, Gerald K.

80

Examples Chemical Name Herbicide Family Target Weed  

E-print Network

Herbicide Brand Name Examples Chemical Name Herbicide Family Target Weed Sps. Mode of Action Y2000) acetic acid phenoxy broadleaf weeds Auxin mimic $35/gal WeedHo Clopyralid Reclaim ® , Curtail®, Transline- pyridinyl]oxy]phenoxy]propanoic acid arylozyphenoxy- propionate annual and perennial grasses Inhibits acetyl

Nowak, Robert S.

81

Weed Research Texas AgriLife Research  

E-print Network

107L-08 KIXOR - GRAIN SORGHUM - BURNDOWN 22 108L-08 KIXOR - GRAIN SORGHUM - WEED CONTROL - I 27 109L-08 KIXOR - GRAIN SORGHUM - WEED CONTROL - II 30 110L-08 KIXOR - COTTON - BURNDOWN 33 111L-08 COTTON SORGHUM - TOLERANCE - II 76 121L-08 WEED CONTROL PROG. WITH EXPRESS HERBICIDE IN EXPRESSSUN TRAIT PIONEER

Mukhtar, Saqib

82

Weed control efficacy with Racer (ammonium nonanoate)  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control is a major challenge in conventional and organic production systems. Agricultural weed control costs the U.S. economy more than the cost of insect and disease control combined. Organic vegetable producers have many challenges since their weed control tools are mostly limited to cultur...

83

Managing weeds with a population dynamics approach  

Technology Transfer Automated Retrieval System (TEKTRAN)

No-till cropping systems are increasing land productivity. A critical aspect of no-till is controlling weeds. Herbicides are a crucial tool for weed management, but weed resistance is decreasing control efficacy and increasing input costs. Scientists and producers are seeking a broader perspectiv...

84

Control of Summer Annual Grass Weeds  

E-print Network

Control of Summer Annual Grass Weeds in Turfgrasses Summer annual grasses continue to be pervasive weed problems in many turfgrass areas throughout Pennsylva nia. The most common summer annual grasses.), and barnyard grass (Echi- nochloa crusgalli). Satisfactory control of these weeds can be obtained by cultural

Kaye, Jason P.

85

Comparison of various weed control programs for potatoes  

Microsoft Academic Search

All weed control programs resulted in satisfactory weed control. Costs of controlling weeds ranged from $10 to $93\\/ha. Cultivation\\u000a alone was the cheapest method of controlling weeds. Controlling weeds by using herbicides alone with no cultivation resulted\\u000a in the highest weed control costs but tended to give the best weed control at harvest. Herbicides saved one to two cultivations.\\u000a EPTC

Mohsen Chitsaz; D. C. Nelson

1983-01-01

86

CLASSICAL BIOLOGICAL CONTROL OF WEEDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Classical biological control of weeds is an important tool for managing invasive alien plants that have become too widespread to control by conventional methods. It involves the discovery and release of naturally occurring species of natural enemies (insects, mites or pathogens) to control a pest (...

87

Genomics and Weeds: A Synthesis  

Technology Transfer Automated Retrieval System (TEKTRAN)

Genomics can be used to solve many problems associated with the management of weeds. New target sites for herbicides have been discovered through functional genomic approaches to determine gene function. Modes of action of herbicides can be clarified or discovered by transcriptome analysis. Under...

88

Weed Control in Texas Pastures.  

E-print Network

CULTIVATED PASTURE WEEDS IN ~~~~~-(cont??ued) Gr o Common name' Botanical name2 Growing Response ,jed season' Areas foundS to . life' 2,4.~'. qeli Chickweed Cerastium spp. Jacquemontia tamnifolia Xanthium spp. Rudbeckia spp. Coreopsis spp...

Long, John A.; Trew, E. M.

1958-01-01

89

Organic weed control in squash  

Technology Transfer Automated Retrieval System (TEKTRAN)

Corn gluten meal (CGM) has been identified as an organic herbicide for weed control in turf and established vegetable plants, direct contact with vegetable seeds can decrease crop seedling development and plant survival by inhibiting root and shoot development. Therefore, the use of CGM as a preemer...

90

Preemergence herbicides affect critical period of weed control in cotton  

Technology Transfer Automated Retrieval System (TEKTRAN)

Effective weed control systems must eliminate emerged weeds as well as account for subsequent weed emergence. Two common questions associated with herbicide control are: 1) how long can weeds compete with a crop for resources before yield is reduced and 2) when do weeds that emerge late in the seaso...

91

Ground-Based Sensing System for Weed Mapping in Cotton  

Technology Transfer Automated Retrieval System (TEKTRAN)

A ground-based weed mapping system was developed to measure weed intensity and distribution in a cotton field. The weed mapping system includes WeedSeeker® PhD600 sensor modules to indicate the presence of weeds between rows, a GPS receiver to provide spatial information, and a data acquisition and ...

92

The future for weed control and technology.  

PubMed

This review is both a retrospective (what have we missed?) and prospective (where are we going?) examination of weed control and technology, particularly as it applies to herbicide-resistant weed management (RWM). Major obstacles to RWM are discussed, including lack of diversity in weed management, unwillingness of many weed researchers to conduct real integrated weed management research or growers to accept recommendations, influence or role of agrichemical marketing and governmental policy and lack of multidisciplinary research. We then look ahead to new technologies that are needed for future weed control in general and RWM in particular, in areas such as non-chemical and chemical weed management, novel herbicides, site-specific weed management, drones for monitoring large areas, wider application of 'omics' and simulation model development. Finally, we discuss implementation strategies for integrated weed management to achieve RWM, development of RWM for developing countries, a new classification of herbicides based on mode of metabolism to facilitate greater stewardship and greater global exchange of information to focus efforts on areas that maximize progress in weed control and RWM. There is little doubt that new or emerging technologies will provide novel tools for RMW in the future, but will they arrive in time? PMID:24339388

Shaner, Dale L; Beckie, Hugh J

2014-09-01

93

WeedScience,50:281-292. 2002 Multivariateanalysis in weed science research  

E-print Network

WeedScience,50:281-292. 2002 Review Multivariateanalysis in weed science research N. C. Kenkel Corresponding author. Department of Botany, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2; kenkel

Kenkel, Norm

94

94 Weed Science 54, JanuaryFebruary 2006 Weed Science, 54:9499. 2006  

E-print Network

, IL 61801; mmwillms@uiuc.edu Rick A. Boydston United States Department of Agriculture­ Agricultural%, but a significant number of weeds survived this experimental treatment (Boydston and Sey- mour 1996). Hand weeding

Sims, Gerald K.

95

Revised 1/09 PLANT / WEED IDENTIFICATION AND CONTROL  

E-print Network

Revised 1/09 PLANT / WEED IDENTIFICATION AND CONTROL Items with * must be completed for control ____________________ Date submitted ___________________ Mail report (No email) PLANT OR WEED INFORMATION. Items with * must ______________________________ rate ____________________________when__________________________ none used unknown 6. If weed

Duchowski, Andrew T.

96

Robotic Weed Control System for Tomatoes  

Microsoft Academic Search

A real-time intelligent robotic weed control system was developed for selective herbicide application to in-row weeds using machine vision and precision chemical application. The robotic vision system took 0.34s to process one image, representing a 11.43 cm by 10.16 cm region of seedline containing 10 plant objects, allowing the prototype robotic weed control system to travel at a continuous rate

W. S. LEE; D. C. SLAUGHTER; D. K. GILES

1999-01-01

97

Mechanical Destruction of Weeds: A Review  

Microsoft Academic Search

Methods of mechanical destruction of weeds in relation to their biology are reviewed. Depending on the stage of growth and\\u000a type of weed, i.e. the depth at which new shoots can be formed and the ability to withstand burial, implements inflict damage\\u000a on weeds in different ways: cutting, burial, uprooting. The various types of damage are shown. The three main

D. Chicouene

98

Weed Invasions in Western Canada Cropping Systems  

Microsoft Academic Search

Agricultural ecosystem weeds can be invasive species. On the Canadian Prairies, the vast majority of weeds that annually invade\\u000a crops and interfere with crop production are self-sustaining, non-native species that have spread over large areas. Weeds\\u000a have vulnerabilities that can be exploited by combining optimal agronomic practices in addition to herbicide application.\\u000a Some of these practices include competitive cultivars, relatively

K. Neil Harker; Robert E. Blackshaw; Hugh J. Beckie; John T. O'Donovan

99

Mechanical destruction of weeds. A review  

Microsoft Academic Search

The various methods of mechanical removal of weeds in relation to their biology are reviewed. Depending on the stage of growth\\u000a and type of weed, i.e. the depth at which new shoots can be formed and the ability to withstand burial, implements inflict\\u000a damage on weeds in different ways: cutting, burial or uprooting. The various types of damage are exemplified.

D. Chicouene

2007-01-01

100

Factors which facilitate waste water treatment by aquatic weeds – the mechanism of the weeds’ purifying action  

Microsoft Academic Search

Aquatic weeds such as water hyacinth, salvinia, pistia, and lemna have proved to be powerful bioagents which significantly purify wastewater lying under them. Even the performance of conventional oxidation ponds can be greatly enhanced by the simple expedient of introducing one of these aquatic weeds. Weeds absorb certain pollutants. But the contribution of absorption to the overall treatment is only

Tasneem Abbasi; S. A. Abbasi

2010-01-01

101

N-Q Weed killer  

NSDL National Science Digital Library

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: A liquid weed-killer comes in four different bottles, all with the same active ingredient. The accompanying table gives information about the concentra...

102

The importance of weeds in ethnopharmacology.  

PubMed

Tropical primary forest is often considered to be the most important habitat for traditional peoples to gather medicinal plants. However, the role of weeds, commonly found in disturbed areas, in traditional medicinal floras has been overlooked. Data are presented showing the significant representation of weeds in the medicinal floras of the Highland Maya in Chiapas, Mexico and in the medicinal flora of Native North Americans as a whole. The frequency with which weeds appear in these pharmacopoeias is significantly larger (P<0.0001) than what would be predicted by the frequency of weed species in general. Explanations based on human ecology and biochemical ecology are presented. PMID:11282438

Stepp, J R; Moerman, D E

2001-04-01

103

7 CFR 360.200 - Designation of noxious weeds.  

Code of Federal Regulations, 2012 CFR

...Jepson) Heckard Striga spp. (witchweeds) (c) Terrestrial weeds: Acacia nilotica (Linnaeus) Wildenow ex Delile (gum arabic tree, thorny acacia Ageratina adenophora (Sprengel) King & Robinson (crofton weed)...

2012-01-01

104

7 CFR 360.200 - Designation of noxious weeds.  

Code of Federal Regulations, 2013 CFR

...Jepson) Heckard Striga spp. (witchweeds) (c) Terrestrial weeds: Acacia nilotica (Linnaeus) Wildenow ex Delile (gum arabic tree, thorny acacia Ageratina adenophora (Sprengel) King & Robinson (crofton weed)...

2013-01-01

105

7 CFR 360.200 - Designation of noxious weeds.  

Code of Federal Regulations, 2014 CFR

...Jepson) Heckard Striga spp. (witchweeds) (c) Terrestrial weeds: Acacia nilotica (Linnaeus) Wildenow ex Delile (gum arabic tree, thorny acacia Ageratina adenophora (Sprengel) King & Robinson (crofton weed)...

2014-01-01

106

Dominant species of dicot-weeds and weed biodiversity in spring barley in Latvia.  

PubMed

The composition of weed species in spring barley and weed biodiversity was evaluated in experiments in different growing seasons and with different previous crops. The aim of the experiments was to evaluate the composition of weed species in spring barley during a four year period in weather conditions of different growing seasons and with different previous crop as well as to assess the biodiversity in the experiments where the different groups of herbicides were applied. Over years and previous crops, the dicotyledonous weed community was dominated by Chenopodium album, followed by Viola arvensis. The herbicides from different groups had significant influences on the biodiversity of weeds. PMID:21542476

Vanaga, I; Mintale, Z; Smirnova, O

2010-01-01

107

WEED SUPPRESSION WITH ORGANIC MULCH IN ORCHARDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Synthetic herbicides often are used to control weeds that cause yield loss and contribute to insect pests and diseases in orchards. Alternative weed management may be required due to negative public perception and possible regulatory restriction of some synthetic herbicides and to the increase of o...

108

Control of grassy weeds in annual canarygrass  

Microsoft Academic Search

There are currently no herbicides registered in Argentina for the selective control of grassy weeds in annual canarygrass (Phalaris canariensis L.). The principal grassy weeds are darnel ryegrass (Lolium temulentum L.) and wild oats (Avena fatua L.), which cause grain yield and quality losses. The potential of diclofop-methyl and clordinafop-propargyl for their control was assessed through greenhouse and field trials,

M. Cogliatti; V. F. Juan; F. Bongiorno; H. Dalla Valle; W. J. Rogers

2011-01-01

109

Molecular biology approaches to weed management  

Technology Transfer Automated Retrieval System (TEKTRAN)

Global climate change appears to be favorable for invasive weed development and spread because invasive species in general are proficient at succeeding in new environments. To worsen matters, herbicide-resistant weeds have become a severe threat in modern agricultural systems due to the extensive us...

110

Nutsedge ecology in plasticulture affects weed management  

Technology Transfer Automated Retrieval System (TEKTRAN)

Purple nutsedge and yellow nutsedge are naturalized exotic invasive weeds that are the most troublesome weeds of vegetable crops in the southeast US. Tubers are the primary means of nutsedge reproduction. Effective management strategies must suppress nutsedge tuber production. Greenhouse studies eva...

111

PRECISION FARMING TECHNIQUES FOR WEED MANAGEMENT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Preliminary studies were conducted to investigate methods of geo- referencing weed locations in fields for site-specific application of herbicides. Ground-based and aerial methods were examined. Ground-based methods included scouting fields with a backpack GPS and marking areas where weeds were pr...

112

WEED MANAGEMENT WITH COVER CROP MULCHES  

Technology Transfer Automated Retrieval System (TEKTRAN)

Residue from desiccated cover crops can play a significant role in integrated weed management systems. Weed suppression by cover crop residue is influenced by many factors including the quantity, physical properties, and chemical properties of the residue as well as the sensitivity of the affected ...

113

Post-directed weed control in squash  

Technology Transfer Automated Retrieval System (TEKTRAN)

Organic squash (Cucurbita pepo L.) producers need appropriate herbicides that can effectively provide season- long weed control. Research was conducted in southeast Oklahoma (Atoka County, Lane, OK) to determine the impact of a potential organic herbicide on weed control efficacy, crop injury, and ...

114

Scythe (pelargonic acid) weed control in squash  

Technology Transfer Automated Retrieval System (TEKTRAN)

Organic squash (Cucurbita pepo L.) producers need appropriate herbicides that can effectively provide season-long weed control. Research was conducted in southeast Oklahoma (Atoka County, Lane, OK) to determine the impact of a potential organic herbicide on weed control efficacy, crop injury, and y...

115

Why herbicides fail Extension Weed Specialist  

E-print Network

Why herbicides fail J. Ferrell Extension Weed Specialist and Greg MacDonald Weed Scientist #12;Where we are today · Herbicides are more potent and environmentally friendly than ever before ­ Much lower use rates (ounces vs. pounds/A) ­ Greater selectivity #12;#12;#12;Why do herbicides fail

Watson, Craig A.

116

Management of insect pests and weeds  

Microsoft Academic Search

The Cuban government has undertaken the task of transforming insect pest and weed management from conventional to organic and more sustainable approaches on a nationwide basis. This paper addresses past programs and current major areas of research and implementation as well as provides examples of programs in insect and weed management. Topics covered include the newly constructed network of Centers

Jeff Dlott; Ivette Perfecto; Peter Rosset; Larry Burkham; Julio Monterrey; John Vandermeer

1993-01-01

117

Weeding the Library Media Center Collections.  

ERIC Educational Resources Information Center

These guidelines for weeding library media collections are addressed to elementary and secondary school library media centers and to community college and vocational school library resource centers in Iowa. The publication includes some philosophy about weeding, and specific guidelines are summarized in bold-faced type for ease of use. The…

Buckingham, Betty Jo

118

Weed competition and dry bean yield components  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed competition can significantly reduce dry bean (Phaseolus vulgaris L.) yields and therefore the profitability for the producer. Depending on the dry bean variety produced, the yield components may be affected differently by the stress produced by weed competition. This research was conducted to ...

119

Broadleaf weed control in lima beans.  

Technology Transfer Automated Retrieval System (TEKTRAN)

Broadleaf weeds are particularly troublesome in lima beans due to the long growing season which extends beyond the period in which soil residual herbicides provide control. Weeds reduce yield and quality of lima beans, reduce harvest efficiency, and increase incidence of white mold. A study was co...

120

The importance of weeds in ethnopharmacology  

Microsoft Academic Search

Tropical primary forest is often considered to be the most important habitat for traditional peoples to gather medicinal plants. However, the role of weeds, commonly found in disturbed areas, in traditional medicinal floras has been overlooked. Data are presented showing the significant representation of weeds in the medicinal floras of the Highland Maya in Chiapas, Mexico and in the medicinal

John R. Stepp; Daniel E. Moerman

2001-01-01

121

Weed Control Efficacy With Ammonium Nonanoate for Organic Vegetable Production  

Microsoft Academic Search

Organic Producers Rank Weed Management Research as their top priority. Organic vegetable producers have many challenges because their weed control tools are mostly limited to cultural methods, with a strong dependence on excessive tillage, cultivation, and hand-hoeing for weed control. Very few chemical weed control options have been approved for organic use. Racer®, ammonium nonanoate, is a new contact herbicide

Charles L. Webber III; James W. Shrefler; Lynn P. Brandenberger; Merritt J. Taylor; Lynda K. Carrier; D. Kent Shannon

2010-01-01

122

A Survey of Weeds in Various Crops in Georgia 1  

Microsoft Academic Search

A survey of county extension agents was conducted in 1998 to determine the most troublesome weeds in corn, cotton, forages and pastures, peanut, small grains, soybean, tobacco, and vegetables in Georgia. The most troublesome weed statewide averaged over all crops was sicklepod. It was the most troublesome weed in cotton and soybean and among the four most troublesome weeds in

THEODORE M. WEBSTER; GREGORY E. MACDONALD

2001-01-01

123

A rotational framework to reduce weed density in organic systems  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds are a major obstacle to successful crop production in organic farming. Producers may be able to reduce inputs for weed management by designing rotations to disrupt population dynamics of weeds. Population-based management in conventional farming has reduced herbicide use 50% because weed den...

124

Nevada's Noxious Weed Program Nevada Department of Agriculture  

E-print Network

Nevada's Noxious Weed Program Nevada Department of Agriculture Dawn Rafferty, State Weed Program Coordinator #12;NEVADA'S NOXIOUS WEED LAW "...I didn't know yellow starthistle was illegal...." #12;What is a noxious weed? Legal definition (NRS 555.005) "any species of plant which is, or is likely to be

Nowak, Robert S.

125

Jill Schroeder Professor, Entomology, Plant Pathology, and Weed Science,  

E-print Network

Jill Schroeder Professor, Entomology, Plant Pathology, and Weed Science, New Mexico State@nmsu.edu Education 1985 Ph.D. Department of Agronomy (Weed Science), University of Georgia, Athens, GA 1981 M, and Professor of Weed Science Department of Entomology, Plant Pathology, and Weed Science, NMSU Primary Research

Johnson, Eric E.

126

Weed Biology and Management 5, 6976 (2005) RESEARCH PAPER  

E-print Network

Weed Biology and Management 5, 69­76 (2005) RESEARCH PAPER Weed composition and cover after three, could lead to increased weed problems for agricultural production. This experiment was conducted to assess weed pressure and species composition on plots receiving various inorganic and organic soil

Lehmann, Johannes

2005-01-01

127

Influence of glyphosate-resistant cropping systems on weed species shifts and glyphosate-resistant weed populations  

Microsoft Academic Search

Glyphosate-resistant (GR) crops have facilitated increases in conservation tillage production practices and simplified weed control in GR corn, soybean, canola and cotton. Increased reliance on glyphosate, many times as the only active ingredient used, has resulted in weed species shifts and the evolution of weed populations resistant to glyphosate. However, weed shifts and the evolution of herbicide resistance are not

William G. Johnson; Vince M. Davis; Greg R. Kruger; Stephen C. Weller

2009-01-01

128

Noxious Weed Survey of Peterson Air Force Base October 31, 2003  

E-print Network

Noxious Weed Survey of Peterson Air Force Base October 31, 2003 Prepared For: Peterson Air Force WEED STATUS BY SPECIES .................................................................................................. 17 APPENDIX 1: NOXIOUS WEED MAPS

129

Weed seeds on clothing: a global review.  

PubMed

Weeds are a major threat to biodiversity including in areas of high conservation value. Unfortunately, people may be unintentionally introducing and dispersing weed seeds on their clothing when they visit these areas. To inform the management of these areas, we conducted a systematic quantitative literature review to determine the diversity and characteristics of species with seeds that can attach and be dispersed from clothing. Across 21 studies identified from systematic literature searches on this topic, seeds from 449 species have been recorded on clothing, more than double the diversity found in a previous review. Nearly all of them, 391 species, are listed weeds in one or more countries, with 58 classified as internationally-recognised environmental weeds. When our database was compared with weed lists from different countries and continents we found that clothing can carry the seeds of important regional weeds. A total of 287 of the species are listed as aliens in one or more countries in Europe, 156 are invasive species/noxious weeds in North America, 211 are naturalized alien plants in Australia, 97 are alien species in India, 33 are invasive species in China and 5 are declared weeds/invaders in South Africa. Seeds on the clothing of hikers can be carried to an average distance of 13 km, and where people travel in cars, trains, planes and boats, the seeds on their clothing can be carried much further. Factors that affect this type of seed dispersal include the type of clothing, the type of material the clothing is made from, the number and location of the seeds on plants, and seed traits such as adhesive and attachment structures. With increasing use of protected areas by tourists, including in remote regions, popular protected areas may be at great risk of biological invasions by weeds with seeds carried on clothing. PMID:24956465

Ansong, Michael; Pickering, Catherine

2014-11-01

130

WEED MANAGEMENT IN POTATOES WITH SPARTAN HERBICIDE  

Technology Transfer Automated Retrieval System (TEKTRAN)

Spartan (sulfentrazone) is a new herbicide for weed management in potatoes. Sulfentrazone applied preemergence controls hairy and black nightshade, redroot pigweed, common lambsquarters, and kochia in potatoes. Spartan may be tank mixed with metribuzin, s-metolachlor, rimsulfuron, pendimethalin, o...

131

EBIPM 2013 planner for preventing weed invasion  

Technology Transfer Automated Retrieval System (TEKTRAN)

Using a calendar format, this publication is designed for land managers to make management decisions for preventing weed invasions in a timely manner. For each month there are recommendations for wee prevention management actions....

132

Weed Busters: How to Neutralize Silverleaf Nightshade  

E-print Network

Extension publication L-5465, Weed Busters Sprayer Calibration Guide. Prepare the Herbicide Mix A mixture of either Grazon P+D?, Weedmaster?, or Range Star? is recommended to control silverleaf nightshade. Weedmaster? and Range Star? both con- tain dicamba...

2005-03-07

133

Using Weeds and Wildflowers to Study Plants.  

ERIC Educational Resources Information Center

Offers suggestions for activities in which local weeds and wildflowers are used to study a variety of topics. These topics include classification, ecological succession, and mapping. Also lists the types of experiments students can perform with these plants. (JN)

Nowak, Nancy

1984-01-01

134

Global perspective of herbicide-resistant weeds.  

PubMed

Two hundred and twenty weed species have evolved resistance to one or more herbicides, and there are now 404 unique cases (species?×?site of action) of herbicide-resistant weeds globally. ALS inhibitor-resistant weeds account for about a third of all cases (133/404) and are particularly troublesome in rice and cereals. Although 71 weed species have been identified with triazine resistance, their importance has dwindled with the shift towards Roundup Ready® crops in the USA and the reduction of triazine usage in Europe. Forty-three grasses have evolved resistance to ACCase inhibitors, with the most serious cases being Avena?spp., Lolium?spp., Phalaris?spp., Setaria?spp. and Alopecurus?myosuroides, infesting more than 25?million hectares of cereal production globally. Of the 24 weed species with glyphosate resistance, 16 have been found in Roundup Ready® cropping systems. Although Conyza?canadensis is the most widespread glyphosate-resistant weed, Amaranthus?palmeri and Amaranthus?tuberculartus are the two most economically important glyphosate-resistant weeds because of the area they infest and the fact that these species have evolved resistance to numerous other herbicide sites of action, leaving growers with few herbicidal options for their control. The agricultural chemical industry has not brought any new herbicides with novel sites of action to market in over 30?years, making growers reliant on using existing herbicides in new ways. In addition, tougher registration and environmental regulations on herbicides have resulted in a loss of some herbicides, particularly in Europe. The lack of novel herbicide chemistries being brought to market combined with the rapid increase in multiple resistance in weeds threatens crop production worldwide. PMID:24302673

Heap, Ian

2014-09-01

135

Weed Biology and Management 3, 204212 (2003) Introduced weeds pollinated by introduced bees  

E-print Network

species may be influenced by this research. Keywords: Apis mellifera, Bombus spp., invasive weeds, weed,and that in some cases they depend totally on these plants as sources of nectar and pollen. It is also apparent.Although few studies have been carried out,we show that those reported so far all point to increased seed set

136

Weed escapes and delayed weed emergence in glyphosate-resistant soybean  

Technology Transfer Automated Retrieval System (TEKTRAN)

During 2001 and 2002, field experiments were conducted in soybean crops at four Minnesota locations with the aim of studying the effects of different glyphosate treatments (one-pass glyphosate, two-pass glyphosate) on weed control and weed community composition by focusing on the identity and abunda...

137

248 Weed Science 50, MarchApril 2002 Weed Science, 50:248260. 2002  

E-print Network

248 · Weed Science 50, March­April 2002 Weed Science, 50:248­260. 2002 Applications of hydrothermal et al. 2000). This ability of seeds to remain viable but quiescent allows them to persist in soil them to persist as soil seed banks from which a fraction of seeds are available to germinate

Bradford, Kent

138

Weed seed production, crop planting pattern, and mechanical weeding in wheat  

Microsoft Academic Search

Experiments were carried out to investigate weed seed production in widely spaced spring wheat crops that received aggressive mechanical weed control (hoeing and harrowing) compared with that in narrowly spaced crops receiving less aggressive mechanical control (harrowing only). Three species (wild buckwheat [Polygonum convolvulus], ladysthumb [Polygonum persicaria], and common chickweed [Stellaria media]) were studied in three row-spacing treatments (10, 20,

Shana K. Mertens

2002-01-01

139

Plant Pathogens at Work: Progress and Possibilities for Weed Biocontrol Part 2. Improving Weed Control Efficacy  

Technology Transfer Automated Retrieval System (TEKTRAN)

The development of plant pathogenic weed biological control agents can be approached using two strategies, termed the classical and biological approaches. The classical involves the search for pathogens in the native range of an invasive weed and its importation and release into the area of introdu...

140

SHIFTS IN VINEYARD WEED SEED BANK COMPOSITION IN REPONSE TO ORGANIC AND CONVENTIONAL WEED CONTROL PRACTICES  

Technology Transfer Automated Retrieval System (TEKTRAN)

The aim of this research was to compare the organic weed control practice, soil cultivation, to the conventional practice, applications of the herbicide, glyphosate, in terms of their effects on weed seed bank in a vineyard system. The experiment was conducted in a commercial winegrape vineyard in t...

141

Weed control in rose-scented geranium (Pelargonium spp).  

PubMed

Abstract: Field investigations were carried out during 1999 and 2000 to identify effective chemical/ cultural methods of weed control in rose-scented geranium (Pelargonium spp). The treatments comprised pre-emergence applications of oxyfluorfen (0.15, 0.20 and 0.25 kg AI ha(-1)) and pendimethalin (0.50, 0.75 and 1.00kg AI ha(-1)), successive hand weeding, hoeing and mulching using spent of lemon grass (at 5 tonnes ha(-1)) 45 days after planting (DAP), three hand-weedings 30, 60 and 90 DAP, weed-free (frequent manual weeding) and weedy control. Broad-leaf weeds were more predominant than grass and sedge weeds, accounting for 85.8% weed density and 93.0% weed dry weight in 1999 and 77.2% weed density and 93.9% weed dry weight in 2000. Unrestricted weed growth significantly reduced geranium oil yield, by 61.6% and 70.6% in 1999 and 2000, respectively. Pre-emergence application of pendimethalin (0.75-1.00 kgAI ha(-1)) or oxyfluorfen (0.25 kg AI ha(-1)), successive hand-weeding, hoeing and mulching and three hand-weedings were highly effective in reducing weed density and dry weight and gave oil yield comparable to the weed-free check. Application of oxyfluorfen (0.15 or 0.20 kg AI ha(-1)) and pendimethalin (0.50 kg AI ha(-1)) were less effective in controlling the weed species in geranium. None of the herbicides impaired the quality of rose-scented geranium oil measured in terms of citronellol and geraniol content. PMID:12477000

Kothari, Sushil K; Singh, Chandra P; Singh, Kamla

2002-12-01

142

STRATEGIES FOR DEVELOPING BIOHERBICIDES FOR SUSTAINABLE WEED MANAGEMENT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Biological weed control is an important component in sustainable crop production systems. Environmental and social pressures that shift the dependency on chemical herbicides towards integrated weed management strategies have provided opportunities for use of bioherbicides. A pragmatic approach in ...

143

Weed control options for organically grown vine crops  

Technology Transfer Automated Retrieval System (TEKTRAN)

Organic melon production requires effective weed management practices for achieving acceptable crop yield and quality. Research conducted in 2010 in southeastern Oklahoma (Lane, OK) compared several possible weed management strategies for cantaloupe. Treatments included black plastic mulch, black wo...

144

Texas High Plains Vegetable & Weed Control Research Program  

E-print Network

RESULTS OF HIGH PLAINS TRIALS 8 Herbicides and Weed Control Herbicide screen for mustard and collard greens ......................................................................... 9 Selected herbicides of selected herbicides for weed control and injury in yellow squash .................................. 13

Mukhtar, Saqib

145

LESS KNOWN USES OF WEEDS AS MEDICINAL PLANTS  

PubMed Central

In this paper the author presents medicinal or otherwise useful weed species with details of family, vernacular name and its medicinal utility. Information on other general economic importance of medicinal weeds is also described here. PMID:22557414

Sahu, T. R.

1984-01-01

146

Sequential applications of pelargonic acid for weed control in squash  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control can be a constant challenge, especially when dealing with the limited herbicide options available to organic vegetable producers. Organic squash (Cucurbita pepo L.) producers need appropriate herbicides that can effectively provide weed control throughout the production season. Although...

147

Table 1. Summary of weed seedbank distribution, diversity (number of species per field) and density across all farms Unit Total Weeds Average Highest Lowest  

E-print Network

Table 1. Summary of weed seedbank distribution, diversity (number of species per field) and density across all farms Unit Total Weeds Average Highest Lowest Total Identified Weed Species number 67 13 21 5 Total Identified Weed Species Densityb no./ft 2 274 1081 30 Total Identified Broadleaf Weed Species

Hayden, Nancy J.

148

Guidelines for management of noxious weeds at Hanford  

SciTech Connect

Integrated Pest Management Services is responsible for management and control of noxious weeds on the Hanford Site. Weed species and populations are prioritized and objective defined, according to potential site and regional impact. Population controls are implemented according to priority. An integrated approach is planned for noxious weed control in which several management options are considered and implemented separately or in coordination to best meet management objectives. Noxious weeds are inventories and monitored to provide information for planning and program review.

Roos, R.C.; Malady, M.B.

1995-10-27

149

Onion and weed response to mustard (Sinapis alba) seed meal  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in organic onion production is often difficult and expensive, requiring numerous cultivations and extensive hand-weeding. Onion safety and weed control with mustard seed meal (MSM) derived from Sinapis alba was evaluated in greenhouse and field trials. MSM applied at 110, 220, and 440 g...

150

Weed Community Response to No-Till in North America  

Technology Transfer Automated Retrieval System (TEKTRAN)

Scientists and producers in Ukraine are interested in no-till crop production, but are concerned about weed management. In North America, producers have used no-till systems for several decades without increasing weed community density in croplands. Initially, weed density escalated with no-till, ...

151

WEED CONTROL BPG NOTE 11 Best Practice Guidance  

E-print Network

WEED CONTROL BPG NOTE 11 Best Practice Guidance for Land Regeneration Introduction Weed control important factors leading to tree loss. Weed control methods fall into two broad categories: cultural of tree chosen and area into which it is planted. Trees planted into more fertile land, for example well

152

Simple tools and software for precision weed mapping  

Technology Transfer Automated Retrieval System (TEKTRAN)

Simple Tools and Software for Precision Weed Mapping L. Wiles If you have a color digital camera and a handheld GPS unit, you can map weed problems in your fields. German researchers are perfecting technology to map weed species and density with digital cameras for precision herbicide application. ...

153

AXXE® (pelargonic acid) and Racer® (ammonium nonanoate): Weed control comparisons  

Technology Transfer Automated Retrieval System (TEKTRAN)

Organic vegetable producers need herbicides that can provide effective season-long weed control. The availability and use of effective post-emergence organic herbicides would increase the likelihood of season-long weed control, reduce crop loses, and decrease the introduction of additional weed seed...

154

MANAGING INVASIVE PLANTS IN NATURAL AREAS: MOVING BEYOND WEED CONTROL  

Microsoft Academic Search

Exotic invasive plants present one of the greatest challenges to natural resource management. These weeds can alter entire communities and ecosystems, substantially degrading important ecosystem services such as forage for wild and domestic herbivores, water and soil quality, recreational values, and wildlife habitat. Traditionally, weed management in natural areas has focused on removing the target weed under the assumption that

Dean Pearson; Yvette Ortega

155

Effect of Fertilizer Nitrogen on Weed Emergence and Growth  

Microsoft Academic Search

The timing of nitrogen (N) fertilizer application may influence germination, emergence, and competitiveness of weeds. Research was conducted to determine the influence of total inorganic soil N( N it) on the germination, emergence, and growth of five weed species. In a greenhouse experiment, seed of five weed species were exposed to four levels of N, and seed germination was measured.

Amy E. Sweeney; Karen A. Renner; Carrie Laboski; Adam Davis

2008-01-01

156

Agricultural weed research: a critique and two proposals  

Technology Transfer Automated Retrieval System (TEKTRAN)

Two broad aims drive weed science research: improved management and improved understanding of weed biology and ecology. In recent years, agricultural weed research addressing these two aims has effectively split into separate sub-disciplines despite repeated calls for greater integration. While some...

157

The Effect of Laser Treatment as a Weed Control Method  

Microsoft Academic Search

A laser beam directed towards weeds can be an efficient weed control method as an alternative to herbicides. Lasers may deliver high-density energy to selected plant material, raising the temperature of the water in the plant cells and thereby stop or delay the growth. A commercial use of lasers for weed control, however, require a systematic investigation of the relationship

Solvejg K. Mathiassen; Thomas Bak; Svend Christensen; Per Kudsk

2006-01-01

158

7 CFR 201.52 - Noxious-weed seeds.  

Code of Federal Regulations, 2011 CFR

7 Agriculture 3 2011-01-01 2011-01-01 false Noxious-weed...4) for the classification of weed seeds and inert matter, respectively. (b) A noxious-weed seed examination of coated seed samples shall be made by...

2011-01-01

159

Potential Weed Management Systems for Organic Peanut Production  

Technology Transfer Automated Retrieval System (TEKTRAN)

Studies were conducted in Tifton, GA to develop weed management systems for organic peanut production. Trials in 2004 and 2005 evaluated row patterns (two levels), remedial weed control (four levels), and cultivation (three levels). Row patterns were wide rows and narrow rows. Remedial weed contr...

160

Pest Control in Corn and Soybeans: Weeds - Insects - Diseases.  

ERIC Educational Resources Information Center

This document gives the characteristics and application rates for herbicides used to control annual weeds in corn, annual and perennial broadleaf weeds in corn, quackgrass and yellow nutsedge in corn, and annual weeds in soybeans. It also gives insecticide use information for corn and soybeans. A brief discussion of disease control in corn and…

Doersch, R. E.; And Others

161

Texas High Plains Vegetable & Weed Control Research Program  

E-print Network

Texas High Plains Vegetable & Weed Control Research Program Research Summary Reports 2006 Texas Experiment Station Russell W. Wallace Extension Vegetable & Weed Specialist Alisa K. Petty Research ................................................... 7 RESULTS OF HIGH PLAINS TRIALS 8 Herbicides and Weed Control Evaluation of Firestorm Applied

Mukhtar, Saqib

162

Weeds-wheat discrimination using hyperspectral imagery Xavier Hadoux1  

E-print Network

Weeds-wheat discrimination using hyperspectral imagery Xavier Hadoux1 *, Nathalie Gorretta1 between weeds and crop by computer vision remains today a major obstacle to the promotion of localized weeding practices. The objective of the present study was to evaluate the potential of hyperspectral

Paris-Sud XI, Université de

163

7 CFR 201.52 - Noxious-weed seeds.  

Code of Federal Regulations, 2014 CFR

...2014-01-01 2014-01-01 false Noxious-weed seeds. 201.52 Section 201.52...Administration of the Act § 201.52 Noxious-weed seeds. (a) The determination of...bulblets, or tubers of individual noxious weeds present per unit weight should be...

2014-01-01

164

ORIGINAL PAPER Development and validation of a weed screening tool  

E-print Network

ORIGINAL PAPER Development and validation of a weed screening tool for the United States Anthony L 2011 Ó Springer Science+Business Media B.V.(outside the USA) 2011 Abstract The Australian weed risk of weeds and invasive plants into new areas. On average, the Australian model identifies major

Schweik, Charles M.

165

Interannual variation in weed biomass on arable land in Sweden  

E-print Network

Interannual variation in weed biomass on arable land in Sweden P MILBERG, E HALLGREN* & M W PALMER 1999 Summary Data were analysed on weed biomass from untreated plots in 2672 ®eld experiments conducted) among years in the biomass of annual weeds per square metre was 29% in autumn-sown crops. In spring

Palmer, Michael W.

166

Weeds Sampling for Map Reconstruction: a Markov Random Field Approach  

E-print Network

Weeds Sampling for Map Reconstruction: a Markov Random Field Approach M. Bonneau1,2 , S. Gaba2 , N In the past 15 years, there has been a growing interest for the study of the spatial repartition of weeds of these methods is that they are based on in situ collection of data about weeds spatial repartition. A crucial

Boyer, Edmond

167

7 CFR 201.52 - Noxious-weed seeds.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 2012-01-01 false Noxious-weed seeds. 201.52 Section 201.52...Administration of the Act § 201.52 Noxious-weed seeds. (a) The determination of...bulblets, or tubers of individual noxious weeds present per unit weight should be...

2012-01-01

168

7 CFR 201.52 - Noxious-weed seeds.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Noxious-weed seeds. 201.52 Section 201.52...Administration of the Act § 201.52 Noxious-weed seeds. (a) The determination of...bulblets, or tubers of individual noxious weeds present per unit weight should be...

2013-01-01

169

From Conventional to Organic: Weed Management Principles for the  

E-print Network

From Conventional to Organic: Weed Management Principles for the Transition Years Fabián Menalled.montana.edu/cropweeds #12;A Disclaimer · This is not going to be a "traditional" weed extension presentation · Your best weed management tool is located between your ears www.forages.oregonsate.edu #12;Today, we'll talk more

Maxwell, Bruce D.

170

Phenological observations on shrubs to predict weed emergence in turf  

Microsoft Academic Search

Phenology is the study of periodic biological events. If we can find easily recognizable events in common plants that precede or coincide with weed emergences, these plants could be used as indicators. Weed seedlings are usually difficult to detect in turf, so the use of phenological indicators may provide an alternative approach to predict the time when a weed appears

Roberta Masin; Maria Clara Zuin; Giuseppe Zanin

2005-01-01

171

237-Response of a weed community to nitrogen fertilization -Response of a weed community to nitrogen fertilization  

E-print Network

237- Response of a weed community to nitrogen fertilization - Response of a weed community to nitrogen fertilization: a multivariate analysis Pysek, Petr1 & Leps, Jan2 1Institute of Applied Ecology, CS-mail KRIVAN%CSEARN@SEARN; Abstract. The effect of nitrogen fertilizers on the composition of a weed community

Leps, Jan "Suspa"

172

Characterization of an EST database for the perennial weed leafy spurge: an important resource for weed biology research  

Technology Transfer Automated Retrieval System (TEKTRAN)

Genomics programs in the weed science community have not developed as rapidly as that of other crop, horticultural, forestry, and model plant systems. Development of genomic resources for selected model weeds are expected to enhance our understanding of weed biology, just as they have in other plant...

173

[Control effects of rice-duck farming and other weed management strategies on weed communities in paddy fields].  

PubMed

By the methods of community ecology, field studies were conducted to evaluate the control effects of three weed management strategies, i. e., rice-duck farming (RD), manual weeding (MW) and chemical weeding (CW), on the weed communities in paddy fields. The results showed that under rice-duck farming, the weed density in paddy fields decreased significantly, and the control effects on dominant weed species such as Monochoria vaginalis, Cyperus difformis, Sagittaria pygmaea were all above 95%, with an overall effect higher than CW and MW. Under RD, the species richness and Shannon-Wiener diversity indices decreased slightly, while Pielou community evenness indices increased markedly, indicating that the species composition of weed community was greatly improved, and the infestation of former dominant weed species was reduced. The structure of weed communities in paddy fields varied with different weed management strategies, e. g., under RD, Lindernia procumbens, Cyperus difformis and Fimbristylis miliacea constituted the major weed community, and the Whittaker index was significant higher than that of CW, MW and CK, which indicated that rice-duck farming had a greater effect on the structure of the weed communities. The same conclusion could be drawn from Sorensen's similarity indices and cluster analysis with Sorensen's index as the distance measurement. PMID:16180755

Wei, Shouhui; Qiang, Sheng; Ma, Bo; Wei, Jiguang; Chen, Jianwei; Wu, Jianqiang; Xie, Tongzhou; Shen, Xiaokun

2005-06-01

174

Effects of controlled weed densities and soil types on soil nitrate accumulation, spruce growth, and weed growth  

Microsoft Academic Search

Soil nitrate (NO3?) accumulation rates were assessed among seven weed species grown in small plots during the summer of 1997, at a northern Ontario location. Objectives were (1) to quantify soil nitrate accumulation rates at varying weed densities established on three soil types (clay, loam, and sand) and (2) to assess the effects of soil nitrate levels on weed and

Naresh V. Thevathasan; Phillip E. Reynolds; Ralf Kuessner; Wayne F. Bell

2000-01-01

175

Detecting Weed Infestations in Soybean Using Remote Sensing.  

NASA Astrophysics Data System (ADS)

Can weed distribution maps be developed from remote sensed reflectance data? When are the appropriate times to collect these data during the season? What wavebands can be used to distinguish weedy from weed- free areas? This research examined if and when reflectance could be used to distinguish between weed-free and weed-infested (mixed species) areas in soybean and to determine the most useful wavebands to separate crop, weed, and soil reflectance differences. Treatments in the two-year study included no vegetation (bare soil), weed-free soybean, and weed-infested soybean and, in one year, 80% corn residue cover. Reflectance was measured at several sampling times from May through September in 2001 and 2002 using a hand-held multispectral radiometer equipped with band-limited optical interference filters (460 - 1650 nm). Pixel resolution was 0.8-m. Reflectance in the visible spectral range (460 to 700 nm) generally was similar among treatments. In the near-infrared (NIR) range (>700 to 1650 nm), differences among treatments were observed from soybean growth stage V-3 (about 4 weeks after planting) until mid-July to early August depending on crop vigor and canopy closure (76 cm row spacing in 2001 and 19 cm row spacing in 2002). Reflectance rankings in the NIR range when treatments could be differentiated were consistent between years and, from lowest to highest reflectance, were soil < weed-free < weed-infested areas. Increased reflectance from weed-infested areas was most likely due to increased biomass and canopy cover. Residue masked differences between weed-free and weed- infested areas during the early stages of growth due to high reflectance from the residue and reduced weed numbers in these areas. These results suggest that NIR spectral reflectance collected prior to canopy closure can be used to distinguish weed-infested from weed-free areas.

Clay, S. A.; Chang, J.; Clay, D. E.; Dalsted, K.; Reese, C.

2007-12-01

176

Weed Busters: How to Pound Threadleaf Groundsel  

E-print Network

L-5470 9/05 How to Pound Threadleaf Groundsel (Senecio) Safe and effective three-step ways to control threadleaf groundsel Weed Treatment Series Allan McGinty, Charles Hart and J. F. Cadenhead Extension Range Specialists The Texas A&M University..., in cooperation with the United States Department of Agriculture. Edward G. Smith, Director, Texas Cooperative Extension, The Texas A&M University System. 1.5M, New T readleaf groundsel, also known as Senecio, is a shrubby perennial weed commonly found...

McGinty, Allan; Hart, Charles R.; Cadenhead, J. F.

2005-10-05

177

Suggestions for Weed Control in Sorghum  

E-print Network

. (atrazine) Novartis and several others 0.8 to 1.0 qt. 0.9 to 1.1 lbs. Postemergence to small weeds. A surfactant or crop oil concentrate will enhance postemergence control. Additional herbicides will be needed for spring and summer weed control. Numerous...-metolachlor) Novartis 1.5 to 2.5 pts. 1 to 1.67 pts. Early preplant (30 to 45 days before planting), preplant incorporated or preemergence. Concep ? treated seed are required. Under high soil moisture conditions before to sorghum emergence, injury may occur. Small...

Baumann, Paul A.; Coffman, Cloyce G.

2001-05-04

178

Detecting Late-Season Weed Infestations in Soybean (Glycine max) 1  

Microsoft Academic Search

Field experiments were conducted in 1999 at Stoneville, MS, to determine the potential of multispectral imagery for late-season discrimination of weed-infested and weed-free soybean. Plant canopy composition for soybean and weeds was estimated after soybean or weed canopy closure. Weed canopy estimates ranged from 30 to 36% for all weed-infested soybean plots, and weeds present were browntop millet, barnyardgrass, and

CLIFFORD H. KOGER; DAVID R. SHAW; CLARENCE E. WATSON; KRISHNA N. REDDY

2003-01-01

179

Virus infection of a weed increases vector attraction to and vector fitness on the weed  

PubMed Central

Weeds are important in the ecology of field crops, and when crops are harvested, weeds often become the main hosts for plant viruses and their insect vectors. Few studies, however, have examined the relationships between plant viruses, vectors, and weeds. Here, we investigated how infection of the weed Datura stramonium L. by tomato yellow leaf curl virus (TYLCV) affects the host preference and performance of the TYLCV vector, Bemisia tabaci (Gennadius) Q. The results of a choice experiment indicated that B. tabaci Q preferentially settled and oviposited on TYLCV-infected plants rather than on healthy plants. In addition, B. tabaci Q performed better on TYLCV-infected plants than on healthy plants. These results demonstrate that TYLCV is indirectly mutualistic to B. tabaci Q. The mutually beneficial interaction between TYLCV and B. tabaci Q may help explain the concurrent outbreaks of TYLCV and B. tabaci Q in China. PMID:23872717

Chen, Gong; Pan, Huipeng; Xie, Wen; Wang, Shaoli; Wu, Qingjun; Fang, Yong; Shi, Xiaobin; Zhang, Youjun

2013-01-01

180

Molecular Biology and Genomics: New Tools for Weed Science  

NSDL National Science Digital Library

Some plant species are particularly well adapted to environments disturbed by humans. Often such species are invasive and problematic, and thus are classified as weeds. Despite our best efforts to manage weeds, they continue to interfere with crop production. There is clearly much to learn about weeds, information that could aid in weed management and improve competitiveness in nonweedy species. The tools of molecular biology have been enlisted in ongoing efforts to manage weeds, most notably in the development and commercialization of crop plants tailored to resist certain herbicides. Molecular biology also has been used to gain a better understanding of how weeds compete and interact with neighboring plants, survive harsh environmental conditions, and evolve resistance to the herbicides used to control them. The next generation of molecular biology tools, such as genomic resources, may yield novel weed management strategies and shed new light on what makes plants weedy.

Patrick Tranel (University of Illinois; College of Agricultural, Consumer, and Environmental Sciences)

2009-03-01

181

Chloropicrin effect on weed seed viability  

Microsoft Academic Search

Chloropicrin is a potential replacement for methyl bromide as a preplant soil fumigant. Its weed control efficacy was evaluated in a laboratory dose–response study and in a commercial strawberry field. Laboratory studies found that an increase in chloropicrin concentration and exposure time reduced the percentage of viable Stellaria media (L.) Mill., Portulaca oleracea L. and Polygonum aviculare L. seed. Chloropicrin

M. J. Haar; S. A. Fennimore; H. A. Ajwa; C. Q Winterbottom

2003-01-01

182

Weed Science and Technology. MP-17.  

ERIC Educational Resources Information Center

This document is one in a series distributed by the Agricultural Extension Service of the University of Wyoming-Laramie. It presents the principles and methods of weed control especially as it relates to the use of herbicides. The factors influencing the effectiveness of both foliar-applied and soil-applied herbicides are discussed. A listing of…

Alley, Harold P.; Lee, Gary A.

183

Alternathera philoxeroides (Martius) Grisebach - alligator weed  

Technology Transfer Automated Retrieval System (TEKTRAN)

Biological control of Alternanthera philoxeroides, alligator weed, began when George Vogt, USDA, conducted several surveys by public transport in South America during the 1960s. Three agents were released in USA and two of them, the flea beetle Agasicles hygrophila and the moth Arcola malloi were re...

184

Weed Busters: How to Repel Rayless Goldenrod  

E-print Network

contacting desirable plants and shrubs with spray. ? Controlling rayless goldenrod is not a one-time job. You may need to re-treat periodically. L-5464 1/05 How to Repel Rayless Goldenrod Safe and effective three-step ways to control rayless goldenrod Weed...

2005-03-07

185

Bioactive compounds for pest and weed control  

Technology Transfer Automated Retrieval System (TEKTRAN)

The control of insect pests and invasive weeds has become more species-selective because of activity-guided isolation, structure elucidation, and total synthesis of naturally produced substances with important biological activities. Examples of isolated compounds include insect pheromones, antifeed...

186

RISING CARBON DIOXIDE AND WEED ECOLOGY  

Technology Transfer Automated Retrieval System (TEKTRAN)

Documented and projected changes in the concentration of atmospheric carbon dioxide [CO2] and other gases suggest potential changes in climate stability which could negatively impact human systems. One such system would involve negative impacts on agricultural crops and associated weeds. Climatic o...

187

Weed Research in Alfalfa Seed Production 2007  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in alfalfa seed production is important to produce high quality and high yield of alfalfa seed. Herbicides were tested on a commercial field of alfalfa seed in central Washington in 2007. Flumioxzin slightly injured alfalfa when applied at 0.125 and 0.25 lb ai/a. to dormant alfalfa in M...

188

Bio-gas production from alligator weeds  

NASA Technical Reports Server (NTRS)

Laboratory experiments were conducted to study the effect of temperature, sample preparation, reducing agents, light intensity and pH of the media, on bio-gas and methane production from the microbial anaerobic decomposition of alligator weeds (Alternanthera philoxeroides. Efforts were also made for the isolation and characterization of the methanogenic bacteria.

Latif, A.

1976-01-01

189

Aminopyralid residue impacts on potatoes and weeds  

Technology Transfer Automated Retrieval System (TEKTRAN)

Aminopyralid is used in Alaska to control certain invasive weed species; however it appears to have an extended soil half-life in interior Alaska resulting in carry-over injury in potatoes. Field studies at three experiment stations in Delta Junction, Fairbanks, and Palmer, Alaska were established ...

190

Jimson "Loco" Weed Abuse in Adolescents.  

ERIC Educational Resources Information Center

Over a 3-year period, 29 adolescent patients were hospitalized because of intentional Jimson weed ingestion. Their records were reviewed for the presence of signs and symptoms of atropine/scopolamine toxicity, clinical course, treatment, and outcome. Journal availability: Arthur Retlaw and Associates, Inc., Suite 2080, 1603 Orrington Avenue,…

Shervette, Robert E., III; And Others

1979-01-01

191

Potential of fungi for the biological control of some New Zealand weeds  

Microsoft Academic Search

The potential for fungi to control 14 important weeds in New Zealand is reviewed. Information provided includes the fungi already known from these weeds in New Zealand, fungi recorded from the native ranges of the weeds, and past work on the control of these weeds using fungi, both in New Zealand and elsewhere. The 14 weeds are: Berberis spp.; Buddleja

Peter R. Johnston

1990-01-01

192

NITROGEN FERTILIZER AND CROP RESIDUE EFFECTS ON SEED MORTALITY OF EIGHT ANNUAL WEED SPECIES  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed seed persistence in the soil seedbank plays a central role in weed population dynamics, yet limited knowledge of mechanisms regulating weed seed survival in soil remains an obstacle to developing weed seedbank management practices. Weed seeds are rich in carbon and nitrogen, and therefore may ...

193

South Carolina Pest Management Handbook for Field Crops -2014 WEED CONTROL IN SUNFLOWER  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2014 262 WEED CONTROL IN SUNFLOWER Mike Marshall, Extension Weed Specialist Preplant/Burndown Herbicides for Weed Management in Sunflowers anytime before planting when weeds are small. Use a higher rate for larger weeds. Add a COC (1-2 gal per

Duchowski, Andrew T.

194

A non-chemical system for online weed control.  

PubMed

Non-chemical weed control methods need to be directed towards a site-specific weeding approach, in order to be able to compete the conventional herbicide equivalents. A system for online weed control was developed. It automatically adjusts the tine angle of a harrow and creates different levels of intensity: from gentle to aggressive. Two experimental plots in a maize field were harrowed with two consecutive passes. The plots presented from low to high weed infestation levels. Discriminant capabilities of an ultrasonic sensor were used to determine the crop and weed variability of the field. A controlling unit used ultrasonic readings to adjust the tine angle, producing an appropriate harrowing intensity. Thus, areas with high crop and weed densities were more aggressively harrowed, while areas with lower densities were cultivated with a gentler treatment; areas with very low densities or without weeds were not treated. Although the weed development was relatively advanced and the soil surface was hard, the weed control achieved by the system reached an average of 51% (20%-91%), without causing significant crop damage as a result of harrowing. This system is proposed as a relatively low cost, online, and real-time automatic harrow that improves the weed control efficacy, reduces energy consumption, and avoids the usage of herbicide. PMID:25831085

Rueda-Ayala, Victor; Peteinatos, Gerassimos; Gerhards, Roland; Andújar, Dionisio

2015-01-01

195

7 CFR 360.300 - Notice of restrictions on movement of noxious weeds.  

Code of Federal Regulations, 2013 CFR

...of restrictions on movement of noxious weeds. 360.300 Section 360.300 Agriculture...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.300 Notice of restrictions on movement of noxious weeds. No person may move a Federal...

2013-01-01

196

7 CFR 360.302 - Consideration of applications for permits to move noxious weeds.  

Code of Federal Regulations, 2012 CFR

...applications for permits to move noxious weeds. 360.302 Section 360.302 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.302 Consideration of applications for permits to move noxious weeds. Upon the receipt of an...

2012-01-01

197

7 CFR 360.302 - Consideration of applications for permits to move noxious weeds.  

Code of Federal Regulations, 2014 CFR

...applications for permits to move noxious weeds. 360.302 Section 360.302 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.302 Consideration of applications for permits to move noxious weeds. Upon the receipt of an...

2014-01-01

198

7 CFR 360.300 - Notice of restrictions on movement of noxious weeds.  

Code of Federal Regulations, 2011 CFR

...of restrictions on movement of noxious weeds. 360.300 Section 360.300 Agriculture...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.300 Notice of restrictions on movement of noxious weeds. No person may move a Federal...

2011-01-01

199

7 CFR 360.300 - Notice of restrictions on movement of noxious weeds.  

Code of Federal Regulations, 2014 CFR

...of restrictions on movement of noxious weeds. 360.300 Section 360.300 Agriculture...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.300 Notice of restrictions on movement of noxious weeds. No person may move a Federal...

2014-01-01

200

7 CFR 360.302 - Consideration of applications for permits to move noxious weeds.  

Code of Federal Regulations, 2011 CFR

...applications for permits to move noxious weeds. 360.302 Section 360.302 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.302 Consideration of applications for permits to move noxious weeds. Upon the receipt of an...

2011-01-01

201

7 CFR 360.501 - Petitions to remove a taxon from the noxious weed lists.  

Code of Federal Regulations, 2011 CFR

...Petitions to remove a taxon from the noxious weed lists. 360.501 Section 360.501...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.501 Petitions to remove a taxon from the noxious weed lists. A person may petition...

2011-01-01

202

7 CFR 360.305 - Disposal of noxious weeds when permits are canceled.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Disposal of noxious weeds when permits are canceled. 360.305 ...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.305 Disposal of noxious weeds when permits are canceled. When a...

2012-01-01

203

7 CFR 360.300 - General prohibitions and restrictions on the movement of noxious weeds; permits.  

Code of Federal Regulations, 2010 CFR

...restrictions on the movement of noxious weeds; permits. 360.300 Section 360...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.300 General prohibitions...restrictions on the movement of noxious weeds; permits. (a) No person may...

2010-01-01

204

7 CFR 360.501 - Petitions to remove a taxon from the noxious weed lists.  

Code of Federal Regulations, 2012 CFR

...Petitions to remove a taxon from the noxious weed lists. 360.501 Section 360.501...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.501 Petitions to remove a taxon from the noxious weed lists. A person may petition...

2012-01-01

205

7 CFR 360.305 - Disposal of noxious weeds when permits are canceled.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Disposal of noxious weeds when permits are canceled. 360.305 ...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.305 Disposal of noxious weeds when permits are canceled. When a...

2011-01-01

206

7 CFR 360.305 - Disposal of noxious weeds when permits are canceled.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Disposal of noxious weeds when permits are canceled. 360.305 ...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.305 Disposal of noxious weeds when permits are canceled. When a...

2013-01-01

207

7 CFR 360.305 - Disposal of noxious weeds when permits are canceled.  

Code of Federal Regulations, 2014 CFR

...2014-01-01 false Disposal of noxious weeds when permits are canceled. 360.305 ...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.305 Disposal of noxious weeds when permits are canceled. When a...

2014-01-01

208

7 CFR 360.501 - Petitions to remove a taxon from the noxious weed lists.  

Code of Federal Regulations, 2013 CFR

...Petitions to remove a taxon from the noxious weed lists. 360.501 Section 360.501...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.501 Petitions to remove a taxon from the noxious weed lists. A person may petition...

2013-01-01

209

7 CFR 360.302 - Consideration of applications for permits to move noxious weeds.  

Code of Federal Regulations, 2013 CFR

...applications for permits to move noxious weeds. 360.302 Section 360.302 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.302 Consideration of applications for permits to move noxious weeds. Upon the receipt of an...

2013-01-01

210

7 CFR 360.501 - Petitions to remove a taxon from the noxious weed lists.  

Code of Federal Regulations, 2014 CFR

...Petitions to remove a taxon from the noxious weed lists. 360.501 Section 360.501...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.501 Petitions to remove a taxon from the noxious weed lists. A person may petition...

2014-01-01

211

7 CFR 360.300 - Notice of restrictions on movement of noxious weeds.  

Code of Federal Regulations, 2012 CFR

...of restrictions on movement of noxious weeds. 360.300 Section 360.300 Agriculture...DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.300 Notice of restrictions on movement of noxious weeds. No person may move a Federal...

2012-01-01

212

[Effects of tillage method and herbicide on cornfield weed community].  

PubMed

By the method of community ecology, this paper surveyed the weed community in a cornfield at the Shenyang Experimental Station of Ecology, CAS, and studied the effects of tillage method and herbicide on the weed composition, species diversity, and biomass at the experimental site. The results showed that the dominant weed species in the cornfield were Eriochloa villosa, Abutilon theophrasti, Bidens frondosa and Commelina communis, of which, Eriochloa villosa had the highest important value. In non-tillage field without herbicide application, the weed community had larger biomass, higher richness (S) and concentration (C), but lower species diversity (D) and species evenness (J). Herbicide could decrease weed species and inhibit biomass growth significantly in non-tillage field. It was clear that tillage method and herbicide could affect the weed composition, diversity and stability significantly. PMID:16422507

Liu, Fangming; Liang, Wenju; Wen, Dazhong

2005-10-01

213

Evaluation of mulching, stale seedbed, hand weeding and hoeing for weed control in organic garden pea (Pisum sativum sub sp. Hortens L.)  

Microsoft Academic Search

Weeds are often recognized as the principal biotic constraint to organic crop production. Development of suitable weed control measures is, therefore, a prerequisite for profitable organic farming. A field experiment was conducted during the winter season of 2003–2004 and 2004–2005 in the Indian Himalayas to evaluate the effect of mulching, stale seedbed, hand weeding and hoeing on weeds and yield

K. A. Gopinath; Narendra Kumar; Banshi L. Mina; Anil K. Srivastva; H. S. Gupta

2009-01-01

214

Feeding Preferences of Weed Seed Predators and Effect on Weed Emergence Sharon S. White, Karen A. Renner, Fabian D. Menalled, and Douglas A. Landis*  

E-print Network

Feeding Preferences of Weed Seed Predators and Effect on Weed Emergence Sharon S. White, Karen A predators and the effect of seed predation on weed emergence. Feeding choice studies were completed seed consumption did not differ between these two weed species. All invertebrates consumed fewer

Landis, Doug

215

Evaluation of integrated weed management practices for chilies in Pakistan  

Microsoft Academic Search

Weed management studies in transplanted chilies were conducted during 2004 and 2005 at the National Agricultural Research Centre, Islamabad, Pakistan. Pendimethalin and oxadiazon at 0.825 and 0.240l a.i.ha?1, respectively were applied 1 week before and 2 days after transplanting and their efficacy alone and in combination with one manual weeding was evaluated to reduce weed competition and its effects on

Khalid Mahmood Khokhar; Tariq Mehmood; Muhammad Shakeel

2007-01-01

216

Spatial and temporal stability of weed populations over five years  

Microsoft Academic Search

The size, location, and variation in time of weed patches within an arable field were analyzed with the ultimate goal of simplifying weed mapping. Annual and perennial weeds were sampled yearly from 1993 to 1997 at 410 permanent grid points in a 1.3-ha no-till field sown to row crops each year. Geostatistical techniques were used to examine the data as

Nathalie Colbach; Frank Forcella; Gregg A. Johnson

2000-01-01

217

Suggestions For Weed Control In Cotton  

E-print Network

Acetyl CoA carboxylase inhibitor 2 lb/gal Syngenta Goal ? 2 XL oxyfluoren Protox inhibitor 1.6 lb/gal Dow AgroSciences Gramoxone ? Max paraquat Photosystem I electron diverter 3.0 lb/gal Syngenta Harmony Extra ? thifensulfuron-methyl Acetolactate... by David Nace, page 20 photograph by Scott Bauer, both of the U.S. Department of Agriculture Suggestions for in Cotton Tables 1. Winter Weed Control Treatments ...............................................6 2. Preplant...

Baumann, Paul A.; Lemon, Robert G.

2007-07-03

218

Weed selection by sheep grazing dryland lucerne  

Microsoft Academic Search

Diet selection by sheep grazing dryland lucerne with a high proportion of weeds was assessed in two consecutive years (2005\\/2006). The study was performed on 2.66 ha of pasture divided in two homogeneous paddocks subjected to a stocking rate of either 10 or 20 sheep\\/paddock, and grazed for 17 days. Before and after each grazing trial, an inventory was conducted

E. Pérez; A. de Vega; I. Delgado; Y. Pueyo

219

Allelopathic aquatic plants for aquatic weed management  

Microsoft Academic Search

This report presents, results of a feasibility study of use of allelopathic aquatic plants for aquatic weed management. In\\u000a order to establish a list of potential allelopathic plants, we selected 16 aquatic plants native to the southeastern United\\u000a States and subjected them to two bioassays — one involving lettuce seedlings and one involving the aquatic plantLemna minor as the target

Stella D. Elakovich

1989-01-01

220

Activity of mesotrione on resistant weeds in maize.  

PubMed

Mesotrione is a new callistemone herbicide that inhibits the HPPD enzyme (p-hydroxyphenylpyruvate dioxygenase) and introduces a new naturally selective tool into weed-management programmes for use in maize. Mesotrione provides control of the major broad-leaved weeds, and it can be used in integrated weed-management programmes depending on the grower's preferred weed-control strategy. At post-emergence rates of 150 g AI ha-1 or less, mesotrione provides naturally selective control of key species that may show triazine resistance (TR), e.g. Chenopodium album L, Amaranthus species, Solanum nigrum L, as well as species of weed that show resistance to acetolactase synthase (ALS) inhibitors e.g. Xanthium strumarium L, Amaranthus spp and Sonchus spp. The data presented show that resistant and susceptible biotypes of these species with resistance to triazine herbicides, such as atrazine, simazine, terbutylazine and metribuzin, or ALS-inhibitor herbicides, such as imazethepyr, remain susceptible to mesotrione. These results confirm that there is no cross-resistance in biotypes with target site resistance to triazine or ALS-inhibiting herbicides. It is important that herbicide choice and rotation becomes an integral part of planning weed management, so as to minimise the risks of crop losses from weed competition, build-up of weed seed in the soil and the further development of weed resistance across a range of herbicide modes of action. PMID:12233193

Sutton, Peter; Richards, Claire; Buren, Larry; Glasgow, Les

2002-09-01

221

Influence of mulches for weed control in the landscape  

E-print Network

evaluated. Treatments which controlled weeds most effectively were decorative pinebark nuggets, the weed barrier fabric, and a 15cm depth of application. However, as the depth of mulch was increased, soil pH, soil nitrogen content, and visual rating... of weed- free soil. The more weeds and weedy grasses growing around the trees, the smaller the increases in the tree growth. Harris (1966) observed a restriction in stem diameter and h gh't f M~1 Mkshdifgl h o g sn ln t bl' ll d turf of tall fescue, g...

Billeaud, Lorraine Ann

1988-01-01

222

Critical Period of Weed Control in Aerobic Rice  

PubMed Central

Critical period of weed control is the foundation of integrated weed management and, hence, can be considered the first step to design weed control strategy. To determine critical period of weed control of aerobic rice, field trials were conducted during 2010/2011 at Universiti Putra Malaysia. A quantitative series of treatments comprising two components, (a) increasing duration of weed interference and (b) increasing length of weed-free period, were imposed. Critical period was determined through Logistic and Gompertz equations. Critical period varied between seasons; in main season, it started earlier and lasted longer, as compared to off-season. The onset of the critical period was found relatively stable between seasons, while the end was more variable. Critical period was determined as 7–49 days after seeding in off-season and 7–53 days in main season to achieve 95% of weed-free yield, and 23–40 days in off-season and 21–43 days in main season to achieve 90% of weed-free yield. Since 5% yield loss level is not practical from economic view point, a 10% yield loss may be considered excellent from economic view point. Therefore, aerobic rice should be kept weed-free during 21–43 days for better yield and higher economic return. PMID:22778701

Anwar, M. P.; Juraimi, A. S.; Samedani, B.; Puteh, A.; Man, A.

2012-01-01

223

RMRS Weed Biocontrol Research: Past Accomplishments, Current Status, and Future Challenges  

E-print Network

RMRS Weed Biocontrol Research: Past Accomplishments, Current Status, and Future Challenges RMRS................................................................................27 Improving Efficacy and Safety to Optimize and Increase Implementation of Successful Classical Weed

224

Ability of weeds to host the root lesion nematodes Pratylenchus neglectus and P. thornei II*. Broad-leaf weeds  

Microsoft Academic Search

Twenty dicotyledonous weed species from nine families were assessed for susceptibility to Pratylenchus neglectus (Rensch) Filipjev Schuurmans & Stekhoven and P. thornei Sher & Allen. The weeds tested are common in crops, pastures and fallows in southern Australia. Weeds were grown at 20°C\\u000a and individual plants inoculated with 2000 nematodes. Based on comparison of the reproductive factor (final population\\/initial\\u000a population,

Vivien A. Vanstone; Michelle H. Russ

2001-01-01

225

UC Davis Weed Science 1 Brad Hanson, Tom Lanini, and Lynn Sosnoskie, UC Davis Weed Science  

E-print Network

,000 tons of prunevariety plums were harvested and processed Value for $153.8 million California accounts floors are managed for a number of reasons Facilitate crop production and harvest practices Weed * - Visor * carfentrazone ­ Shark, Rage clethodim* ­ Prism* clove oil - Matratec 2,4-D diquat* - Diquat* d

Hanson, Brad

226

928 Weed Science 54, SeptemberOctober 2006 Weed Science, 54:928933. 2006  

E-print Network

.S. Department of Agriculture--Agricultural Research Service, Invasive Weed Management Research, University of the CPWC, based on 5% loss of marketable ear mass, was determined by fitting logistic and Gompertz production, especially in cropping systems with a reliance on POST herbicides (Knezevic et al. 2002). However

Sims, Gerald K.

227

264 Weed Science 53, MarchApril 2005 Weed Science, 53:264273. 2005  

E-print Network

for invasive species in west- ern rangelands, aquatic ecosystems and forestry, and site-specific weed management in agronomics. Key words: Decision support systems, invasive species, spatial technologies. Remote through better management decisions, and early detection and effective management of invading species

Brown, Cynthia S.

228

172 Weed Science 52, JanuaryFebruary 2004 Weed Science, 52:172177. 2004  

E-print Network

@mso.umt.edu Spotted knapweed is an invasive mycorrhizal weed prevalent in the Pacific Northwest of the United States. Little is known about the effects of spotted knapweed or its management methods on soil quality and soil structure. This study compared soils from spotted knapweed­infested areas with areas where spotted knapweed

Rilli, Matthias C.

229

Weeds of the Midwestern United States and Central Canada  

Technology Transfer Automated Retrieval System (TEKTRAN)

The book, Weeds of the Central United States and Canada, includes 356 of the most common and/or troublesome weeds of agricultural and natural areas found within the central region of the United States and Canada. The books includes an introduction, a key to plant families contained in the book, glo...

230

Using Mustard Seed Meal and Cover Crops for Weed Control  

Technology Transfer Automated Retrieval System (TEKTRAN)

There continues to be a steady growth in the use of fall planted brassica cover crops in the Columbia Basin especially prior to potatoes. Several benefits include better water infiltration, reclaiming nitrogen, reduced erosion, and suppression of nematodes, diseases, and weeds. Weed suppression is...

231

Waterhyacinth: Florida's Worst Floating Weed1 Lyn A. Gettys2  

E-print Network

SS-AGR-380 Waterhyacinth: Florida's Worst Floating Weed1 Lyn A. Gettys2 1. This document is SS Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension. Introduction Waterhyacinth is a free-floating of waterhyacinth Credits: Lyn Gettys, UF/IFAS #12;2Waterhyacinth: Florida's Worst Floating Weed Classification

Watson, Craig A.

232

Weed Seedling Emergence and Survival as Affected by Crop Canopy  

Technology Transfer Automated Retrieval System (TEKTRAN)

This study measured impact of cool-season crops on seedling emergence, survival, and seed production of weeds common in corn and soybean. Weed dynamics were monitored in permanently-marked quadrats in winter wheat, spring wheat, and canola. Three species, green foxtail, yellow foxtail, and common ...

233

Concepts in weed control -- how does biocontrol fit in?  

Microsoft Academic Search

Up until now there have only been twoprincipal concepts in weed control: control at any cost, and theuse of economic thresholds. Control at any cost is characteristicof situations where no effective control methods are available.The use of economic thresholds has evolved alongside chemicalcontrol, enabling weeds to be controlled effectively and at areasonable price. A future concept may be that of

K. HURLE

1997-01-01

234

SOLARIA HELP PREDICT IN-CROP WEED DENSITIES  

Technology Transfer Automated Retrieval System (TEKTRAN)

At locations in Argentina and USA, solaria (miniature, portable, plastic greenhouses or plastic sheets about 1 m**2) were placed on field soils in autumn or late winter in an attempt to predict summer annual weed densities. Initial emergence of summer annual weeds, covered by solaria commenced weeks...

235

Crop diversity sequencing can improve crop tolerance to weeds  

Technology Transfer Automated Retrieval System (TEKTRAN)

The corn-soybean rotation in eastern South Dakota has led to a weed community comprised of species with similar life cycles to the crops; subsequently, weed management is a major input cost for producers. We are exploring crop diversity in this rotation to determine if producers can reduce the need...

236

Weed science research and funding: a call to action  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed science has contributed much to agriculture, forestry and natural resource management over its history. However, if it is to remain relevant as a scientific discipline, it is long past time for weed scientists to take a step outside the “herbicide efficacy box” and address system-level issues i...

237

Managing weeds in organic farming systems: an ecological approach  

Technology Transfer Automated Retrieval System (TEKTRAN)

Numerous investigators have concluded that improvements in weed management strategies that are minimally reliant on herbicides require the integration of multiple weed suppression tactics. However, the most cost-effective and efficacious ways to choose and combine tactics remain unclear. Here we sug...

238

Cultivation strategies for weed control in organic peanut production  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed management in organic peanut production is difficult and costly. Previous research demonstrated limitations of propane flaming and OMRI-approved herbicides suitable use in organic production. Furthermore, related studies clearly showed the inability to manage weeds in reduced-tillage organic ...

239

Molecular Biology and Genomics: New Tools for Weed Science  

Technology Transfer Automated Retrieval System (TEKTRAN)

Certain plant species are particularly well adapted to environments disturbed by humans. Often such species are invasive and problematic, and thus are classified as weeds. Despite our best efforts to control weeds, they continue to interfere with crop production. Clearly there is much to learn about...

240

Use of cryptic species for biological control of weeds  

Technology Transfer Automated Retrieval System (TEKTRAN)

Classical biological control of weeds depends on the discovery and evaluation of species of arthropods that are highly host specific. The rarity of such species in nature limits our ability to find safe effective agents to control a continually increasing list of invasive alien weeds. However, sci...

241

Ecological interpretation of weed flora dynamics under different tillage systems  

Microsoft Academic Search

In northern Italy, on soil managed with three different tillage systems (conventional tillage, ridge tillage, and no-tillage) and submitted to standard cultural practices (crop rotation, and chemical weed control), the weed vegetation was assessed at the beginning of the trial (1987) and after six, and eight years. The aims were to evaluate (1) the effect of tillage systems on the

Giuseppe Zanin; Stefan Otto; Lara Riello; Maurizio Borin

1997-01-01

242

How to Identify and Control Water Weeds and Algae.  

ERIC Educational Resources Information Center

Included in this guide to water management are general descriptions of algae, toxic algae, weed problems in lakes, ponds, and canals, and general discussions of mechanical, biological and chemical control methods. In addition, pictures, descriptions, and recommended control methods are given for algae, 6 types of floating weeds, 18 types of…

Applied Biochemists, Inc., Mequon, WI.

243

RESEARCH ARTICLE Biodegradable mulch instead of polyethylene for weed  

E-print Network

RESEARCH ARTICLE Biodegradable mulch instead of polyethylene for weed control of processing tomato Abstract Black polyethylene (PE) film is used for mulch- ing in processing tomato (Lycopersicon esculentum be an alternative. Keywords Polyethylene . Biodegradable mulch . Paper. Barley straw 1 Introduction Weeds

Paris-Sud XI, Université de

244

Impact of weed barriers on newly planted peach trees  

Technology Transfer Automated Retrieval System (TEKTRAN)

Newly planted (Feb. 2005) ‘Sunracer’ and ‘Sunhome’ nectarine and ‘Tropic Snow’ peach (Prunus persica (L.) Batsch) trees were subjected to conventional and four 'organic' weed control methods. Two of the 'organic' methods used weed barriers of white plastic (WP) or landscape fabric (LF). A third co...

245

Deciphering the evolution of herbicide resistance in weeds  

E-print Network

Deciphering the evolution of herbicide resistance in weeds Christophe De´lye1 , Marie Jasieniuk2, University of California, Davis, CA 95616, USA Resistance to herbicides in arable weeds is increasing rapidly worldwide and threatening global food securi- ty. Resistance has now been reported to all major herbicide

California at Davis, University of

246

The Importance of Intertrophic Interactions in Biological Weed Control  

Technology Transfer Automated Retrieval System (TEKTRAN)

The earliest research leading to successful weed biocontrol included observations and some analysis that the strict “gate-keeping” by peer reviewers, editors and publishers does not often allow today. Within these pioneering studies was a valid picture of the biology of weed biocontrol that is appli...

247

Emerging Technologies: An Opportunity for Weed Biology Research  

Technology Transfer Automated Retrieval System (TEKTRAN)

The main objective of the Emerging Technologies Symposium at the 2007 WSSA Annual Meeting was to provide the weed science community with the principles behind emerging technologies and how they can be used to study weed biology. Specifically, aspects and applications related to genomic database deve...

248

DICLOSULAM AND IMAZAPIC COMBINATIONS FOR WEED CONTROL IN GEORGIA PEANUT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Florida beggarweed, sicklepod, wild poinsettia, Palmer amaranth, and morningglories remain troublesome weeds in strip- and conventional tillage systems. The objectives of this study were to determine the effect of diclosulam and imazapic combinations on peanut weed control and yield in cropping sit...

249

Corn gluten meal for weed control in cowpea  

Technology Transfer Automated Retrieval System (TEKTRAN)

Cowpea, a major crop in Oklahoma, is produced for the fresh market and canning industry. Synthetic preemergence and postemergence herbicides are the primary weed control method in conventional (non-organic) production systems. Organic weed control in organic cowpea production includes obstacles wh...

250

Seed priming influences weed competitiveness and productivity of aerobic rice  

Microsoft Academic Search

Growing rice under aerobic soil conditions is a promising water-wise technology under the context of ever-mounting water scarcity, but it is subject to poor stand establishment and high weed pressure. The present study was, therefore, designed to explore the possibility of adopting seed priming as a sustainable tool for weed management in aerobic rice. The trough experiment was established with

M. D. Parvez Anwar; Abdul Shukor Juraimi; Adam Puteh; Ahmad Selamat; M. D. Moshiur Rahman; Batoul Samedani

2012-01-01

251

Organic weed management in vegetables: Research, experiences, and opportunities  

Technology Transfer Automated Retrieval System (TEKTRAN)

Organic farmers in a national survey ranked weed management as their greatest research need for organic crop production. Scientists from the Agriculture Research Service and Oklahoma State University have combined their efforts to conduct not only organic weed control research, but research involvi...

252

Evaluation of corn gluten meal for weed control in cowpea  

Technology Transfer Automated Retrieval System (TEKTRAN)

Current weed control practices for cowpea production typically involve use of synthetic herbicides. Increasing interest in organic crop production creates a need for alternative weed control techniques that are consistent with requirements of the USDA National Organic Program. Corn gluten meal (CG...

253

Potential components for weed management in organic vegetable production systems  

Technology Transfer Automated Retrieval System (TEKTRAN)

Organic vegetable production relies on a variety of tactics for preventing losses to crop yield and quality that result from weed interference. These include field selection, long term field management, cultivation practices, mulching, and manual weeding to name a few. The concept of "herbicides" th...

254

A Review of Non-Chemical Weed Control Techniques  

Microsoft Academic Search

Weeding has traditionally been a labour intensive operation in crop production. The use of herbicides was rapidly accepted by many farmers and became an accepted part of crop husbandry, although a few farmers always questioned the widespread use of chemicals in farming, and the concept of organic farming necessitated a non-chemical approach to weed control.The recent upsurge in environmental awareness

S. Parish

1990-01-01

255

Weed manipulation for insect pest management in corn  

NASA Astrophysics Data System (ADS)

Populations of insect pests and associated predaceous arthropods were sampled by direct observation and other relative methods in simple and diversified corn habitats at two sites in north Florida during 1978 and 1979. Through various cultural manipulations, characteristic weed communities were established selectively in alternate rows within corn plots. Fall armyworm ( Spodoptera frugiperda J. E. Smith) incidence was consistently higher in the weed-free habitats than in the corn habitats containing natural weed complexes or selected weed associations. Corn earworm ( Heliothis zea Boddie) damage was similar in all weed-free and weedy treatments, suggesting that this insect is not affected greatly by weed diversity. Only the diversification of corn with a strip of soybean significantly reduced corn earworm damage. In one site, distance between plots was reduced. Because predators moved freely between habitats, it was difficult to identify between-treatment differences in the composition of predator communities. In the other site, increased distances between plots minimized such migrations, resulting in greater population densities and diversity of common foliage insect predators in the weed-manipulated corn systems than in the weed-free plots. Trophic relationships in the weedy habitats were more complex than food webs in monocultures. Predator diversity (measured as mean number of species per area) and predator density was higher in com plots surrounded by mature, complex vegetation than at those surrounded by annual crops. This suggests that diverse adjacent areas to crops provide refuge for predators, thus acting as colonization sources.

Altieri, M. A.; Whitcomb, W. H.

1980-11-01

256

EVALUATION OF WEED CONTROL DURING SWITCHGRASS ESTABLISHMENT WITH POSTEMERGENCE HERBICIDES  

Technology Transfer Automated Retrieval System (TEKTRAN)

Grass weeds can often pose a severe threat to the establishment of switchgrass, so identifying herbicides which can control grass weeds without inhibiting switchgrass growth would prove beneficial. Quinclorac and sulfosulfuron, recently labeled for CRP and seed production, were evaluated for use in...

257

RESEARCH ARTICLE Evidence for weed quantity as the major information  

E-print Network

environmental impacts. To this end, organic farming appears as a promising solution. How- ever organic farming. Therefore there is a need for improved decision support tools for weed management in organic farming a participatory approach. Keywords Weed management . Organic farming . Information . Decision-making . Dynamic

Paris-Sud XI, Université de

258

THE BIOLOGY OF CANADIAN WEEDS. 42. Stellaria media (L.\\ Yill.  

E-print Network

THE BIOLOGY OF CANADIAN WEEDS. 42. Stellaria media (L.\\ Yill. ROY TURKINGTON, NORMAN C. KENKEL. 1980. The biology of Canadian weeds. 42. Stellaria media (L.)Yill. Can. J. Plant Sci. 60: 98r-992. This paper provides a summary of biological data on Stellaria media (L.) Yill., commonly known as chickweed

Kenkel, Norm

259

Effects of seeding date and weed control on switchgrass establishment  

Technology Transfer Automated Retrieval System (TEKTRAN)

An experiment evaluated the effects of seeding date and weed control during switchgrass (Panicum virgatum L.) establishment. Switchgrass was no-till seeded in early-May, late-May, and mid-June and three postemergence weed management treatments were evaluated including mow only, broadleaf herbicide o...

260

Montana Rangeland N i W dNoxious Weeds  

E-print Network

per the MT County Noxious Weed Control Act · 27 state-listed noxious weeds #12;Spotted Knapweed-tipped, black bracts #12;Spotted Knapweed #12;Spotted Knapweedp p · Prevention and Early Detection · HerbicidesBracts have no spots or spines #12;Russian KnapweedRussian Knapweed #12;Russian KnapweedRussian Knapweed

Maxwell, Bruce D.

261

Working the Educational Soil and Pulling Up Weeds  

ERIC Educational Resources Information Center

The job of an instructional leader, according to former Baltimore principal Deborah Wortham, is to be a gardener. School cultures left unattended, she says, sprout weeds that will eventually overwhelm the research-based programs, practices, and best efforts of teachers and administrators. The most aggressive and harmful educational weeds Wortham…

Riggins-Newby, Cheryl

2005-01-01

262

'Carolina' session: a major utilities program to manage aquatic weeds  

SciTech Connect

Carolina Power and Light Company has recently experienced aquatic weed problems in two of its impoundments. These problems have impacted power plant operations, water quality, and recreational activities. The Company is actively pursuing a program to deal with these weed problems through education, research, monitoring, and control activities.

Schiller, D.H.

1984-06-01

263

APPLICATIONS OF SOIL AND RHIZOSPHERE MICROORGANISMS IN SUSTAINABLE WEED MANAGEMENT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Biological control as a single tactic approach for controlling weeds in cultivated crops has not been as efficacious as those approaches involving herbicides and other cultural methods. Bioherbicides designed for application of deleterious rhizobacteria (DRB) to soil for suppression of weed seedling...

264

Growth response of weed and crop seedlings to deleterious rhizobacteria  

Microsoft Academic Search

Selected bacterial isolates previously demonstrated to be suppressive toward weed species in the laboratory were tested for effectiveness under greenhouse conditions. Rhizobacteria varied in ability to inhibit growth of host or nonhost weed species. Some bacterial isolates caused ?75% growth inhibition, while some isolates did not express inhibitory effects under greenhouse conditions. Host specificity of rhizobacteria also varied, with some

Jianmei Li; Robert J. Kremer

2006-01-01

265

HOME GROUNDS & ANIMALS 2014 3-24 Home Fruit: Weeds  

E-print Network

in the soil over time. Eliminate perennial weeds, especially perennial broadleaf weeds, before establishing reduce soil erosion. For large plantings, one acre or more, read the Spray Bulletin for Commercial Tree nutsedge, and other creeping perennials. Be sure that crop roots are not damaged when using cultivation

Liskiewicz, Maciej

266

Applying a weed risk assessment approach to GM crops.  

PubMed

Current approaches to environmental risk assessment of genetically modified (GM) plants are modelled on chemical risk assessment methods, which have a strong focus on toxicity. There are additional types of harms posed by plants that have been extensively studied by weed scientists and incorporated into weed risk assessment methods. Weed risk assessment uses robust, validated methods that are widely applied to regulatory decision-making about potentially problematic plants. They are designed to encompass a broad variety of plant forms and traits in different environments, and can provide reliable conclusions even with limited data. The knowledge and experience that underpin weed risk assessment can be harnessed for environmental risk assessment of GM plants. A case study illustrates the application of the Australian post-border weed risk assessment approach to a representative GM plant. This approach is a valuable tool to identify potential risks from GM plants. PMID:24046097

Keese, Paul K; Robold, Andrea V; Myers, Ruth C; Weisman, Sarah; Smith, Joe

2014-12-01

267

Weed Suppression by Seven Clover Species  

SciTech Connect

Used as cover crops, clover species may differ in their ability to suppress weed growth. Field trials were conducted in Alberta, Canada to measure the growth of brown mustard [Brassica juncea (L.) Czern.], in mowed and nonmowed production, as influenced by alsike (Trifolium hybridum L.), balansa [T. michelianum Savi var. balansae (Boiss.) Azn.], berseem (T. alexandrinum L.), crimson [T. incarnatum (Boiss.) Azn.], berseem (T. alexandrinum L.), crimson (T. incarnatum L.), Persian (T. resupinatum L.), red (T. pratense L.), and white Dutch (T. repens L.) clover and fall rye (Secale cereale L.). In 1997, clovers reduced mustard biomass in nonmowed treatments by 29% on a high- fertility soil (Typic Cryoboroll) at Edmonton and by 57% on a low- fertility soil (Typic Cryoboralf) at Breton. At Edmonton, nonmowed mustard biomass was reduced by alsike and berseem clover in 1996 and by alsike, balansa, berseem, and crimson clover in 1997. At Breton, all seven clover species suppressed weed biomass. A negative correlation was noted among clover and mustard biomass at Edmonton but not at Breton. The effects of mowing varied with location, timing, and species. Mowing was beneficial to crop/weed proportion at Edmonton but not at Breton. Mowing at early flowering of mustard large-seeded legumes and sweetclover (Melilotus offici) produced greater benefit than mowing at late flowering. With early mowing, all clover species suppressed mustard growth at Edmonton. Clovers reduced mustard regrowth (g plant21 ) and the number of mustard plants producing regrowth. The characteristics of berseem clover (upright growth, long stems, high biomass, and late flowering) would support its use as a cover crop or forage in north-central Alberta.

Ross, Shirley M.; King, Jane R.; Izaurralde, R Cesar C.; O'Donovan, John T.

2001-01-01

268

Suggestions for Weed Control in Corn  

E-print Network

Suggestions for Weed Control in Corn 2-02 E E-525 Suggestions for W eed Contr ol in Cor n P aul A. B aumann, P h.D. P r ofessor and E xtension W eed S pecialist T exas Cooperativ e E xtension The T exas A&M U niv ersity S y stem T able P age... T able P age 1 W inter w eed contr ol ............................................................................5 4 P ostemergence and post-dir ect ed herbicides ..................................14 2 P r eplant herbicides for postemergence contr ol...

Baumann, Paul A.

2002-02-19

269

Natural compounds for pest and weed control.  

PubMed

The control of insect pests and invasive weeds has become more species-selective because of activity-guided isolation, structure elucidation, and total synthesis of naturally produced substances with important biological activities. Examples of isolated compounds include insect pheromones, antifeedants, and prostaglandins, as well as growth regulators for plants and insects. Synthetic analogues of natural substances have been prepared to explore the relationships between chemical structure and observed biological activity. Recent scientific advances have resulted from better methods for the chemical synthesis of target compounds and better analytical methods. The capability of analytical instrumentation continues to advance rapidly, enabling new insights. PMID:19719128

Petroski, Richard J; Stanley, David W

2009-09-23

270

PUTTING PLANT PATHOGENS TO WORK: PROGRESS AND POSSIBILITIES IN WEED BIOCONTROL PART 2. IMPROVING WEED CONTROL EFFICACY  

Technology Transfer Automated Retrieval System (TEKTRAN)

The development of plant pathogenic weed biological control agents can be approached using two strategies, termed the classical and biological approaches. The classical involves the search for pathogens in the native range of an invasive weed and its importation and release into the area of introdu...

271

Current substances for organic weed control in vegetables or what do we have in our organic weed control tool box?  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control is the top research priority among organic producers. Organic producers have a short, but growing list of organic approved herbicides. The purpose of this publication is to provide general overview of weed control options for organic crop production. Research has demonstrated that co...

272

Weeding of Academic Library Reference Collections: A Survey of Current Practice.  

ERIC Educational Resources Information Center

Reports results of survey investigating aspects of weeding of materials in reference collections at 377 U.S. colleges and universities: existence of written policy or unwritten weeding practice; extent of weeding; frequency; what happens to discards; effect of shelf space, staff time, and use of materials on weeding decisions. (5 references) (EJS)

Engeldinger, Eugene A.

1986-01-01

273

South Carolina Pest Management Handbook for Field Crops -2013 WEED CONTROL IN PEANUT  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2013 152 WEED CONTROL IN PEANUT Mike Marshall, Extension Weed Specialist Preplant/Burndown Herbicides for Weed Management in Peanut Herbicide/Burndown Herbicides for Weed Management in Peanut (cont) Herbicide Rate/Acre Broadcast Mode of Action Preharvest

Stuart, Steven J.

274

South Carolina Pest Management Handbook for Field Crops -2014 WEED CONTROL IN PEANUT  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2014 163 WEED CONTROL IN PEANUT Mike Marshall, Extension Weed Specialist Preplant/Burndown Herbicides for Weed Management in Peanut Herbicide Management Handbook for Field Crops - 2014 164 Preplant/Burndown Herbicides for Weed Management in Peanut

Duchowski, Andrew T.

275

Weed flora of water rice in the Red River Delta, Vietnam  

Microsoft Academic Search

The occurrence of weeds in water rice was surveyed in the Red River Delta, Vietnam during spring and summer rice-growing seasons in 1995 and 1996. Sixty different weeds from 19 plant families were recorded. The most important plant families as weeds of rice were Poaceae and Cyperaceae. The most important weed however was Rotala indica (Willd.) Koehne (Lythraceae) followed by

Nguyen Hong Son; Ha Minh Trung; Bruce A. Auld; Shane D. Hetherington

2000-01-01

276

Economics of supplemental weed control applications on spring-transplanted onions  

Technology Transfer Automated Retrieval System (TEKTRAN)

Field research conducted to determine the relative benefits among alternative herbicides for weed control in onions (Allium cepa L.) measured weed control efficacy, impact of herbicides on crop injury, and the resulting weed competition on crop yields and marketable bulb size. Weed competition produ...

277

Effects of Weed Management Systems on Canopy Insects in Herbicide-Resistant Soybeans  

Microsoft Academic Search

The effects of transgenic herbicide-resistant soybean varieties and their correspond- ing weed management strategies on canopy insects were examined in studies at two locations in Iowa in 1997 and 1998. Weed management systems that allowed more weed escapes typically had higher insect population densities. However, systems with fewer weeds seemingly were preferred by potato leafhoppers. Bean leaf beetles and potato

L. D. Buckelew; L. P. Pedigo; H. M. Mero; M. D. K. OWEN; G. L. Tylka

2000-01-01

278

Lawn Weeds and Their Control. North Central Regional Extension Publication No. 26.  

ERIC Educational Resources Information Center

This publication discusses lawn weed control for the twelve state north central region of the country. Written for use by homeowners, the publication focuses on weed identification and proper herbicide selection and application. Identification of weeds and safe and appropriate herbicide use are emphasized. Forty-six weed and turf plants are…

Purdue Univ., Lafayette, IN. Cooperative Extension Service.

279

Weed problems in wheat and their control in the Indian subcontinent  

Microsoft Academic Search

The wheat crop suffers badly due to heavy weed infestation. Phalaris minor Retz., Chenopodium albam L., Avena fatua L., Melilotus alba Deser., Melilotus indica All., Anagallis arvensis L., Fumaria parviflora Lam. and Convolvulus arvensis L. are common weeds of wheat in the Indian subcontinent. Besides handhoeing and manual weeding, use of herbicides plays a lårge role in weed management. Minimum

T. P. Mustafee

1991-01-01

280

Integrating management techniques to restore sites invaded by mile-a-minute weed, Persicaria perfoliata  

Technology Transfer Automated Retrieval System (TEKTRAN)

Efforts to suppress an invasive weed are often undertaken with the goal of facilitating the recovery of a diverse native plant community. In some cases, however, reduction in the abundance of the target weed results in an increase in other exotic weeds. Mile-a-minute weed, Persicaria perfoliata (L.)...

281

Managing Weeds in Potato Health Management, ed. D. Johnson. APS Press  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weeds must be managed throughout the entire crop rotation to optimize potato tuber yield and quality. Understanding factors that promote weed species and allow them to persist in crop rotations is key to designing cropping systems that discourage and reduce the impact of weeds. Weeds can be best man...

282

Effects of artificial shading and weed mowing in reforestation of Mediterranean abandoned cropland with contrasting  

E-print Network

Effects of artificial shading and weed mowing in reforestation of Mediterranean abandoned cropland, and weeds are strong competitors for resources, particularly water. We conducted a 3-year experiment of full-light versus artificial shading and weed presence versus weed mowing. We measured seedling

Espigares, Tíscar

283

South Carolina Pest Management Handbook for Field Crops -2013 WEED CONTROL IN TOBACCO  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2013 257 WEED CONTROL IN TOBACCO Mike Marshall, Extension Weed Specialist Preplant (Incorporated) Herbicides for Weed Management in Tobacco by shallow disking. Controls pigweed, ragweed and other broadleaf weeds. Use the higher rate for fields

Stuart, Steven J.

284

Potential of 3D-weed density maps in Precision Matthias Backes and Lutz Plumer  

E-print Network

Potential of 3D-weed density maps in Precision Farming Matthias Backes and Lutz Pl¨umer Institute;pluemer)@ikg.uni-bonn.de WWW: http://www.ikg.uni-bonn.de Abstract. The exact knowledge about the spatial distribution of weeds weed maps derived from spatial sampling continuous threshold-based contours of weed patches or areas

Behnke, Sven

285

South Carolina Pest Management Handbook for Field Crops -2014 WEED CONTROL IN TOBACCO  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2014 270 WEED CONTROL IN TOBACCO Mike Marshall, Extension Weed Specialist Preplant (Incorporated) Herbicides for Weed Management in Tobacco by shallow disking. Controls pigweed, ragweed and other broadleaf weeds. Use the higher rate for fields

Duchowski, Andrew T.

286

Monthly Highlights from Rutgers New Jersey Agricultural Experiment Station January 2009 Weed Control Strategy Differences in  

E-print Network

Monthly Highlights from Rutgers New Jersey Agricultural Experiment Station January 2009 Weed in Weed Science and Jack Rabin, Associate Director - Farm Programs Continued on page 2 Let no weeds go to seeds. Farmers wanting to control weeds with non-chemical herbicide alternatives should

Goodman, Robert M.

287

Weed leaf recognition in complex natural scenes by model-guided edge Benoit De Mezzo1  

E-print Network

Weed leaf recognition in complex natural scenes by model-guided edge pairing Benoit De Mezzo1.demezzo@cemagref.fr ; gilles.rabatel@cemagref.fr ; fiorio@lirmm.fr Abstract New weeding strategies for pesticide reduction rely on the spatial distribution and characterisation of weed populations. For this purpose, weed identification can

Paris-Sud XI, Université de

288

Weed Control 2008 Burley ToBacco ProducTion Guide  

E-print Network

Weed Control 2008 Burley ToBacco ProducTion Guide WEED CONTROL IN BURLEy TOBACCO Charles S. Johnson, Extension Plant Pathologist, Tobacco Good weed control uses crop rotation, early root destruction on the first cultivation for early-season weed control. Some herbicides may also be applied to the row mid- dle

Liskiewicz, Maciej

289

HOME GROUNDS & ANIMALS 2014 Home Ornamentals: Weed Management in Home Ornamental Beds 4-89  

E-print Network

reservoir in the soil. Hoeing or hand pulling weeds controls annu- als weeds, but will not control creeping in the soil over time. Remove any weeds from ornamental plants that will be planted into the landscape. Avoid weeds like bermudagrass, quackgrass, yellow nutsedge, and other creeping perennials need repeated

Liskiewicz, Maciej

290

The selective soil covering mechanism of weed harrows on sandy soil  

Microsoft Academic Search

Improvement of intra-row mechanical weed control is important to reduce the reliance on herbicides in arable crops and vegetables. Covering weeds by soil is an important weed control mechanism of weed harrows. A shallow post-emergence harrow cultivation controls weeds but also damages the crop to some extent. This paper explores how plants get covered by soil and how a plant’s

D. A. G. Kurstjens; U. D. Perdok

2000-01-01

291

Wallowa Canyonlands Weed Partnership : Completion Report November 19, 2009  

SciTech Connect

Noxious weeds threaten fish and wildlife habitat by contributing to increased sedimentation rates, diminishing riparian structure and function, and reducing forage quality and quantity. Wallowa Resources Wallowa Canyonlands Partnership (WCP) protects the unique ecological and economic values of the Hells Canyon grasslands along lower Joseph Creek, the lower Grande Ronde and Imnaha Rivers from invasion and degradation by noxious weeds using Integrated Weed Management techniques. Objectives of this grant were to inventory and map high priority weeds, coordinate treatment of those weeds, release and monitor bio-control agents, educate the public as to the dangers of noxious weeds and how to deal with them, and restore lands to productive plant communities after treatment. With collaborative help from partners, WCP inventoried {approx} 215,000 upland acres and 52.2 miles of riparian habitat, released bio-controls at 23 sites, and educated the public through posters, weed profiles, newspaper articles, and radio advertisements. Additionally, WCP used other sources of funding to finance the treatment of 1,802 acres during the course of this grant.

Porter, Mark C.; Ketchum, Sarah

2008-12-30

292

Capabilities of unmanned aircraft vehicles for low altitude weed detection  

NASA Astrophysics Data System (ADS)

Sustainable crop production and food security require a consumer and environmental safe plant protection. It is recently known, that precise weed monitoring approaches could help apply pesticides corresponding to field variability. In this regard the site-specific weed management may contribute to an application of herbicides with higher ecologically aware and economical savings. First attempts of precision agriculture date back to the 1980's. Since that time, remote sensing from satellites or manned aircrafts have been investigated and used in agricultural practice, but are currently inadequate for the separation of weeds in an early growth stage from cultivated plants. In contrast, low-cost image capturing at low altitude from unmanned aircraft vehicles (UAV) provides higher spatial resolution and almost real-time processing. Particularly, rotary-wing aircrafts are suitable for precise path or stationary flight. This minimises motion blur and provides better image overlapping for stitching and mapping procedures. Through improved image analyses and the recent increase in the availability of microcontrollers and powerful batteries for UAVs, it can be expected that the spatial mapping of weeds will be enhanced in the future. A six rotors microcopter was equipped with a modified RGB camera taking images from agricultural fields. The hexacopter operates within predefined pathways at adjusted altitudes (from 5 to 10 m) by using GPS navigation. Different scenarios of optical weed detection have been carried out regarding to variable altitude, image resolution, weed and crop growth stages. Our experiences showed high capabilities for site-specific weed control. Image analyses with regard to recognition of weed patches can be used to adapt herbicide application to varying weed occurrence across a field.

Pflanz, Michael; Nordmeyer, Henning

2014-05-01

293

The Southern Weed Science Society Weed Contest was held on August 1, 2012 in Fayetteville, AR. This event is an educational experience for undergraduate and graduate students in Southern Universities to  

E-print Network

The Southern Weed Science Society Weed Contest was held on August 1, 2012 in Fayetteville, AR to broaden their applied skills in Weed Science. The contest consists of 5 parts which are weed identification, applicator calibration, herbicide identification by the response of various crops and weeds

Tennessee, University of

294

A Tale of Two Depositories: Weeding Federal Depository Collections  

E-print Network

be weeded. Up to that time, only revised titles listed in the Superseded List (purl.access.gpo. gov/GPO/LPS22813) had been weeded on a limited basis. I was familiar with the federal depository print collection because I had recently helped shift many... the col- lection, and items not superseded had to be offered to other depository libraries before withdrawing (purl.access.gpo.gov/ GPO/LPS89341, Chapter 5.14). After establishing what not to weed, criteria for items for removal were created. Because...

Sare, Laura

2009-01-01

295

Noxious Weeds in the U.S. and Canada  

NSDL National Science Digital Library

This web site provides a searchable database of the noxious weed lists for all U.S. states and six southern provinces of Canada. The database can be searched by plant name, state name, or by clicking on a map. The search can be narrowed down to search for native, exotic, or all species of plants for a particular county. Furthermore, the search can be conducted for the time period that the user chooses. A summary of this database provides a list of all noxious weeds, which can be customized to display in alphabetical order (on scientific name) or by the number of appearances on weed lists.

296

Mixed?weed infestations: Prediction of crop losses for economic weed management in rice  

Microsoft Academic Search

Weed control in Latin America is costly and heavily dependent upon herbicides. Often irrigated rice farmers spray herbicides in late post?emergence at 30–44 days after emergence (d.a.e.). The economic benefits from such late applications are often unclear. Two experimental approaches involving density series of Eclipta alba, Leptochloa filiformis, Eleusine indica a 1:1 mixture of Echinochloa colona and E. crus?galli and

A. J. Fischer; A. Ramirez

1993-01-01

297

Control of aquatic weeds through pollutant reduction and weed utilization: a weed management approach in the lower Kafue River of Zambia  

NASA Astrophysics Data System (ADS)

The aquatic weed situation in the Kafue River in Zambia continues to be a major challenge to the sustainable utilization of the water resources of the river. The general methods for managing the weeds, especially the water hyacinth, include use of bio-agents, chemicals, mechanical and physical approaches. These have had very little impact. This paper reports on a project that is investigating weed management strategies which involve use of cleaner production (CP) approach and the utilization of the weed for economic purposes. In addition, the ecological implications of these methods are being assessed. Effluent assessments indicated that apart from nitrates and phosphates, other effluent parameters met the Environmental Council of Zambia standards. Results further show that all the 24 areas surveyed for CP have uncontrolled socio-economic activities which generate both point and non-point sources of pollution that enter the water bodies. To minimize pollution, efforts include devising policy and technical strategies with the involvement of the affected riparian community. Production of mushroom by the communities using the water hyacinth substrate has been demonstrated. Up to 2.1 kg of mushroom was harvested from a single flush over a period of 4-5 weeks. Vegetables grown on soils treated with water hyacinth manure performed better than those grown using commercial fertiliser. The economics of the production are however, yet to be confirmed. If weed usage is proven economically and ecologically viable, the riverine community is envisaged to play a big role in aquatic weed management. High numbers of invertebrates known to be sensitive to pollution have been recorded in the weed-infested Kafue River implying that the water is of “good” quality for these aquatic invertebrates. This observed quality of water may be due to water hyacinth playing a role by sieving pollutants from the river.

Sinkala, Thomson; Mwase, Enala T.; Mwala, Mick

298

While soil-applied herbicides can be quite valuable in weed control, misuse can cause crop injury or failure to control weeds. This guide  

E-print Network

While soil-applied herbicides can be quite valuable in weed control, misuse can cause crop injury and persistence of soil-applied herbicides. MT200405 AG issued 5/04 D-4 Getting the Most from Soil-Applied Herbicides by Fabián D. Menalled, Extension Cropland Weeds Specialist, and William E. Dyer, Professor, Weed

Maxwell, Bruce D.

299

Crop performance and weed suppression by weed-suppressive rice cultivars in furrow- and flood-irrigated systems under reduced herbicide inputs  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in rice is challenging, particularly in light of increased resistance to herbicides in weed populations and diminishing availability of irrigation water. Certain indica rice cultivars can produce high yields and suppress weeds in conventional flood-irrigated, drill-seeded systems in the...

300

DEVELOPING WEED SUPPRESSIVE SOILS THROUGH IMPROVED SOIL QUALITY MANAGEMENT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Sustainable agriculture is based in part on efficient management of soil microorganisms for improving soil quality. However, identification of biological indicators of soil quality for predicting weed suppression in soils has received little attention. We investigated differences in soil microbial ...

301

Weed Control Sprayers: Calibration and Maintenance. Special Circular 81.  

ERIC Educational Resources Information Center

This manual covers aspects of calibration and maintenance of weed control sprayers including variables affecting application rate, the pre-calibration check, calculations, band spraying, nozzle tip selection, agitation, and cleaning. (BB)

Myers, Arthur L.

302

Cultural control of weeds in herbicide-free annual forages  

Technology Transfer Automated Retrieval System (TEKTRAN)

The adoption of zero tillage systems improves soil water conservation, allowing for increased crop intensification and diversification in the semiarid northern Great Plains. Zero tillage systems rely primarily on herbicides for weed management, increasing selection pressure for herbicide resistance...

303

Appearance of Herbicide Resistance in a Weed Population  

NSDL National Science Digital Library

Through the repeated use of the same herbicide, weed populations can consist of susceptible (S)-biotypes that are controlled and herbicide resistant (R)-biotypes that are left behind to produce and return seed with the resistance characteristic back into the soil. This lesson will highlight the population dynamics of a mixed weed population, containing S- and R-biotypes, and compare and contrast the rate at which herbicide resistant weeds appear in a population under a diversity of selection pressures. This lesson will highlight the population dynamics of a mixed (herbicide susceptible and resistant biotype) weed population, and compare and contrast the rate of appearance of herbicide resistance in a mixed population under a diversity of selection pressures.

304

Chemical Weed and Brush Control: Suggestions for Rangeland  

E-print Network

Millions of acres of Texas rangeland support an excessive cover of woody plants and forbs. This publication lists herbicides to use for controlling brush and weeds on rangeland. It can help in developing a brush management program that gives optimum...

McGinty, Allan; Ansley, Jim; Cadenhead, J. F.; Hamilton, Wayne T.; Hanselka, C. Wayne; Hart, Charles R.; Ueckert, Darrell

2005-04-25

305

Weed macaques: The evolutionary implications of macaque feeding ecology  

Microsoft Academic Search

Patterns of feeding ecology among the living macaques conform poorly with recognized phyletic distinctions within the genus\\u000a because there is an important ecological division which cross-cuts phyletic groupings. This division, between weed species\\u000a and non-weed species, is based on the differing abilities of macaques to tolerate and even prosper in close association with\\u000a human settlements. Based on available information about

A. F. Richard; S. J. Goldstein; R. E. Dewar

1989-01-01

306

[Pseudomonas syringae - the agent of bacterial diseases of weeds].  

PubMed

The symptoms of bacterial diseases of the associated weeds have been identified and described in the wheat crops grown in different farming systems. On the basis of its morphological, biochemical and serological properties the agent isolated from frost-blite, barnyard grass, wild radish, couch grass, bottle-brush, bindweed and sow thistle has been identified as Pseudomonas syringae. Serological affinity between the weed bacteria and the agent of bacterial diseases of cereals has been established. PMID:24006783

Pasichnik, L A; Savenko, E A; Butsenko, L N; Shcherbina, T N; Patyka, V F

2013-01-01

307

The role of biological control in managing parasitic weeds  

Microsoft Academic Search

In contrast to normal weeds, parasitic plants inflict fitness costs by withdrawing water, minerals, and photosynthates from the host. Host-derived material is mainly transferred through straw-like intrusions into the host's vascular tissue. Theoretically, resources are unlimited for parasitic weeds unless the host is killed. Frequent occurrence of host crops in agro-ecosystems results in favourable reproduction conditions for parasitic angiosperms, which

J. Sauerborn; D. Müller-Stöver; J. Hershenhorn

2007-01-01

308

Cover crop residue management for optimizing weed control  

Microsoft Academic Search

Although residue management seems a key factor in residue-mediated weed suppression, very few studies have systematically\\u000a compared the influence of different residue management strategies on the establishment of crop and weed species. We evaluated\\u000a the effect of several methods of pre-treatment and placement of winter rye (Secale cereale L.) and winter oilseed rape (Brassica napus L.) residue on seedling emergence

H. Marjolein Kruidhof; Lammert Bastiaans; Martin J. Kropff

2009-01-01

309

Chemical Weed Control in Japanese Mint (Mentha arvensis L.)  

Microsoft Academic Search

Field investigations were carried out during 1987 and 1988 to compare cultural and chemical control of broad leaf and grass weeds present in the first and second harvest of Japanese mint. Unrestricted weed growth significantly reduced mint oil yield by 58% and 73%, respectively in the first and second harvests. Preemergence applications of terbacil (1.5 kg a.i.\\/ha), pendimethalin (1.0 kg

S. K. Kothari; K. Singh

1994-01-01

310

Engineering hypervirulence in a mycoherbicidal fungus for efficient weed control  

Microsoft Academic Search

Agents proposed for biocontrol of major weeds in arable row-crop agriculture have not met expectations because an evolutionary balance has developed between microorganism and weed, even when the mycoherbicide is used inundatively at very high levels (>104 spores\\/cm2). Sufficient virulence can be achieved by transferring genes to the microorganism, tipping the evolutionary balance. Virulence was increased ninefold and was more

Ziva Amsellem; Barry A. Cohen; Jonathan Gressel

2002-01-01

311

Integrating arthropod herbivory and reduced herbicide use for weed management  

Microsoft Academic Search

Few studies have examined the combined effect of herbicide-induced stress and ar- thropod herbivory to reduce weed fitness. The purpose of this study was to quantify the effect of arthropod herbivory on the herbicide dose-response of a perennial weed. Fluroxypyr dose-response bioassays using volunteer potato were conducted in the presence and absence of Colorado potato beetle (CPB) herbivory. Logistic model

Martin M. Williams; Douglas B. Walsh; Rick A. Boydston

2004-01-01

312

Weed Busters: How to Control Common (Annual) Broomweed  

E-print Network

to use, environmentally responsible and effective. ?The ground broadcast spray method is for larg- er areas with heavy infestations. ? The individual plant leaf spray method can be used for scattered or smaller infestations. Using these weed busters... on how to calibrate a ground broadcast sprayer, see Extension publication L-5465, Weed Busters: Sprayer Calibration Guide. Prepare the Herbicide Mix Several herbicide mixtures may be used to effectively control common broomweed with the ground broad- cast...

2005-03-07

313

Weed Busters: How to Get Drummond's and Common Goldenweed  

E-print Network

livestock or deer, and few cases of poisoning are document- ed. A close relative, rayless goldenrod, causes signif- icant livestock losses annually in West Texas. (See Extension publication L-5464, Weed Busters: How to Repel Rayless Goldenrod.) In recent... spray is best for treating sparse infestations. Using these Weed Busters methods, you will be able to selectively kill unwanted goldenweed plants with little or no damage to desirable vegetation. Your results may vary, but you should be able to kill...

2005-03-07

314

Weed control in glyphosate-tolerant maize in Europe.  

PubMed

Maize growing in the EU27 increased to over 13 million ha in 2007, most of which (>80%) was grown in just eight countries (France, Romania, Germany, Hungary, Italy, Poland, Spain and Bulgaria). The number of herbicides used to control the wide spectrum of weeds occurring in all these countries is likely to decline in the future as each current active ingredient is reassessed for toxicological and environmental safety under Directive 91/414/EEC. Glyphosate has already been approved under this directive. Glyphosate, applied alone or in combination with currently available residual herbicides to genetically modified varieties tolerant to glyphosate, can provide a viable, flexible and profitable alternative to conventional weed control programmes. Glyphosate usage with glyphosate-tolerant varieties also provides an environmentally sustainable weed control option as long as sufficient diversity of weed management options (crop rotation, chemical diversity, multiple cultural and mechanical practices, buffer strips) is maintained within the farm management system. Appropriate product stewardship measures will be required to maximise the long-term overall benefits of the glyphosate-based system. Specifically, care will need to be taken to manage potential weed shifts to more difficult-to-control species and to reduce the risk of selection for glyphosate-resistant weeds. PMID:19557724

Dewar, Alan M

2009-10-01

315

Robust Crop and Weed Segmentation under Uncontrolled Outdoor Illumination  

PubMed Central

An image processing algorithm for detecting individual weeds was developed and evaluated. Weed detection processes included were normalized excessive green conversion, statistical threshold value estimation, adaptive image segmentation, median filter, morphological feature calculation and Artificial Neural Network (ANN). The developed algorithm was validated for its ability to identify and detect weeds and crop plants under uncontrolled outdoor illuminations. A machine vision implementing field robot captured field images under outdoor illuminations and the image processing algorithm automatically processed them without manual adjustment. The errors of the algorithm, when processing 666 field images, ranged from 2.1 to 2.9%. The ANN correctly detected 72.6% of crop plants from the identified plants, and considered the rest as weeds. However, the ANN identification rates for crop plants were improved up to 95.1% by addressing the error sources in the algorithm. The developed weed detection and image processing algorithm provides a novel method to identify plants against soil background under the uncontrolled outdoor illuminations, and to differentiate weeds from crop plants. Thus, the proposed new machine vision and processing algorithm may be useful for outdoor applications including plant specific direct applications (PSDA). PMID:22163954

Jeon, Hong Y.; Tian, Lei F.; Zhu, Heping

2011-01-01

316

Phytotoxicity of sesquiterpene lactone parthenin on aquatic weeds.  

PubMed

The sesquiterpene lactone parthenin, one of the major toxins in an obnoxious weed, parthenium (Parthenium hysterophorus L.), was toxic at 50 ppm to the floating aquatic weeds pistia (Pistia stratiotes L.) and lemna (Lemna pausicostata Hegelm.) and at 100 ppm to water hyacinth (Eichhornia crassipes Mart Solmns.), salvinia (Salvinia molesta Mitchell), azolla (Azolla nilotica Decne.), and spirodella (Spirodella polyrhiza L. Schleid). The lethal dose for the submerged weeds najas (Najas graminea Del.), ceratophyllun (Ceratophyllum demersun L.), and hydrilla (Hydrilla verticillata L. f. Royle) was 25 ppm. The submerged aquatic weeds were more sensitive to parthenin. Water hyacinth was used as a representative for studying the phytotoxicity of parthenin on aquatic weeds. Inhibition of water hyacinth by parthenin was associated with decline in water use, root dysfunction, excessive leakage of solutes from roots indicative of massive damage to cellular membranes, loss of dehydrogenase activity in the roots, and loss of chlorophyll in the leaves. Plant death occurred in a period of one to two weeks. Parthenin phytotoxicity is gradually lost in an aquatic environment as a lethal dose became nonlethal in about 30 days under outdoor conditions. Possible buildup of a toxin concentration may affect population dynamics and a shift in the aquatic weed flora in the immediate area of parthenium stands. Accumulation of the toxin in an aquatic environment, however, at a level sufficient to produce such changes in a natural ecosystem as a consequence of rain washing parthenium plants and leaching of toxin from their residue appears to be unlikely. PMID:24226989

Pandey, D K

1996-01-01

317

Division of Agricultural Sciences and Natural Resources Oklahoma State University Weed Control in Christmas tree plantations is one of  

E-print Network

Division of Agricultural Sciences and Natural Resources · Oklahoma State University Weed Control.Weedscompeteforwater,nutrients,andlight andextendthetimerequiredtoproduceamarketabletree. Successful weed control helps the grower produce high.Finally, reductionofweedsreducesinterferencewithlaborandequip- mentmovementandimprovestheplantation'sappearance forconsumers. Methods of Weed Control Site

Balasundaram, Balabhaskar "Baski"

318

Tillage and residue burning affects weed populations and seed banks.  

PubMed

An integrated weed management approach requires alternative management practices to herbicide use such as tillage, crop rotations and cultural controls to reduce soil weed seed banks. The objective of this study was to examine the value of different tillage practices and stubble burning to exhaust the seed bank of common weeds from the northern grain region of Australia. Five tillage and burning treatments were incorporated in a field experiment, at Armidale (30 degrees 30'S, 151 degrees 40'E), New South Wales, Australia in July 2004 in a randomized block design replicated four times. The trial was continued and treatments repeated in July 2005 with all the mature plants from the first year being allowed to shed seed in their respective treatment plots. The treatments were (i) no tillage (NT), (ii) chisel ploughing (CP), (iii) mould board ploughing (MBP), (iv) wheat straw burning with no tillage (SBNT) and (v) wheat straw burning with chisel ploughing (SBC). Soil samples were collected before applying treatments and before the weeds flowered to establish the seed bank status of the various weeds in the soil. Wheat was sown after the tillage treatments. Burning treatments were only initiated in the second year, one month prior to tillage treatments. The major weeds present in the seed bank before initiating the trial were Polygonum aviculare, Sonchus oleraceus and Avena fatua. Tillage promoted the germination of other weeds like Hibiscus trionum, Medicago sativa, Vicia sp. and Phalaris paradoxa later in the season in 2004 and Convolvulus erubescens emerged as a new weed in 2005. The MBP treatment in 2004 reduced the weed biomass to a significantly lower level of 55 g/m2 than the other treatments of CP (118 g/m2) and NT plots (196 g/m2) (P < 0.05). However, in 2005 SBC and MBP treatments were similar in reducing the weed biomass. In 2004, the grain yield trend of wheat was significantly different between CP and NT, and MBP and NT (P < 0.05) with maximum yield of 5898 kg/ha in CP and 5731 kg/ha in MBP. Rainfall before the start of the second trial season promoted the germination of a large numbers of weeds. SBC and MBP treatments reduced the numbers of most of the individual weed species compared with CP, SBNT and NT. SBC was able to destroy a large proportion of seeds most likely through burning and burying some in the soil and was found to be the best treatment in exhausting the seed bank followed closely by MBP which probably buried large number of seeds deep in the soil and promoted others to germinate. CP might have buried some of the seeds in the top 5-10 cm but also promoted parts of the seed bank to germinate. SBNT and NT provided an ideal medium for weeds to germinate and resulted in heavy infestations of weeds. PMID:17390813

Narwal, S; Sindel, B M; Jessop, R S

2006-01-01

319

75 FR 23151 - Noxious Weeds; Old World Climbing Fern and Maidenhair Creeper  

Federal Register 2010, 2011, 2012, 2013, 2014

...APHIS-2008-0097] Noxious Weeds; Old World Climbing Fern and Maidenhair Creeper AGENCY...noxious weed regulations by adding Old World climbing fern (Lygodium microphyllum...we amended the regulations by adding Old World climbing fern (Lygodium...

2010-05-03

320

Linkages Among Agronomic, Environmental and Weed Management Characteristics in North American Sweet Corn  

Technology Transfer Automated Retrieval System (TEKTRAN)

Performance of weed management systems varies greatly across the landscape in both growers’ fields and in experimental trials conducted by agricultural scientists. Using agronomic, environmental, and weed management information from growers’ fields and experimental trials, we identified dominant ch...

321

Noxious Weed Monitoring at the US Air Force Academy-Year 2 Results  

E-print Network

Noxious Weed Monitoring at the US Air Force Academy- Year 2 Results June 26, 2007 Prepared For: U....................................................................................................................... 11 TABLE OF TABLES Table 1. Noxious weed management objectives for species targeted in this study

322

Natural metabolites for parasitic weed management.  

PubMed

Compounds of natural origin, such as phytotoxins produced by fungi or natural amino acids, could be used in parasitic weed management strategies by interfering with the early growth stages of the parasites. These metabolites could inhibit seed germination or germ tube elongation, so preventing attachment to the host plant, or, conversely, stimulate seed germination in the absence of the host, contributing to a reduction in the parasite seed bank. Some of the fungal metabolites assayed were very active even at very low concentrations, such as some macrocyclic trichothecenes, which at 0.1 microM strongly suppressed the germination of Orobanche ramosa L. seeds. Interesting results were also obtained with some novel toxins, such as phyllostictine A, highly active in reducing germ tube elongation and seed germination both of O. ramosa and of Cuscuta campestris Yuncker. Among the amino acids tested, methionine and arginine were particularly interesting, as they were able to suppress seed germination at concentrations lower than 1 mM. Some of the fungal metabolites tested were also able to stimulate the germination of O. ramosa seeds. The major findings in this research field are described and discussed. PMID:19266492

Vurro, Maurizio; Boari, Angela; Evidente, Antonio; Andolfi, Anna; Zermane, Nadjia

2009-05-01

323

PERENNIAL CROP NURSERIES TREATED WITH METHYL BROMIDE AND ALTERNATIVE FUMIGANTS: EFFECTS ON WEED SEED VIABILITY, WEED DENSITIES, AND TIME REQUIRED FOR HAND WEEDING  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control provided by alternative fumigants to methyl bromide (MeBr) needs to be tested in perennial crop nurseries in California because MeBr is being phased out in accordance with the Montreal Protocol, few herbicides are registered for perennial nursery use, and costs of other control measures...

324

Competition Experiments on Alien Weeds with Crops: Lessons for Measuring Plant Invasion Impact?  

Microsoft Academic Search

Can we quantify the impact of invasive species? Here we use the per-plant competitiveness of alien weeds on crops as a model\\u000a of invasive species impact in general. We reviewed 97 weed–crop competition experiments in 32 papers that included 30 alien\\u000a weed and 14 crop species. The majority (68.92%) were randomised block designs where the alien weed had been either

Montserrat Vilà; Mark Williamson; Mark Lonsdale

2004-01-01

325

Nipping aquatic plant invasions in the bud: weed risk assessment and the trade  

Microsoft Academic Search

The importation and sale of ornamental pond and aquarium plants is the most important pathway for the introduction of potential\\u000a aquatic weeds into and subsequent spread of these within a country. Most current aquatic weeds were at one time deliberately\\u000a imported for ornamental use. This article discusses a weed risk assessment approach to evaluating new potential weeds. It\\u000a assesses the

P. D. Champion; J. S. Clayton; D. E. Hofstra

2010-01-01

326

Poisonous weed species and their significance for cattle production in Serbia region  

Microsoft Academic Search

Weed species that grow on agricultural land together with crop plants cause crop yield reduction and increased costs of agricultural production due to the cost of their control. Beside these direct damages, some weed species cause indirect damages by their adverse effects to human and domestic animals health. In our agroecological conditions the most problematic poisonous weed species are: Solanum

Konstantinovic Branko; Meseldzija Maja

327

Tolerance of selected weed species to broadcast flaming at different growth stages  

Microsoft Academic Search

Organic producers rank weeds as the most important pests that limit their crop production. In order to optimize the use of propane flaming as a weed control tool, the objective of this study was to test tolerance of selected weed species to broadcast flaming performed at different growth stages. Six annual species, including one grass [barnyardgrass (Echinochloa crus-galli)] and five

Santiago M. Ulloa; Avishek Datta; Stevan Z. Knezevic

2010-01-01

328

Establishing a weed prevention area, a step-by-step user's guide  

Technology Transfer Automated Retrieval System (TEKTRAN)

Traditionally, weed management activities are only initiated after a weed has become a major economic problem in an area. This guide provides a process for individuals interested in developing community based weed prevention areas (WPA) to take a proactive approach to invasive species management. ...

329

Beyond Patch Spraying: Site-specific Weed Mmanagement With Multiple Herbicides  

Technology Transfer Automated Retrieval System (TEKTRAN)

Site-specific weed management can include both limiting herbicide to areas of the field where weed pressure is above the economic threshold (patch spraying) and varying the choice of herbicide for most cost-effective weed control of local populations. The benefits of patch spraying with multiple, po...

330

UNITED STATES DEPARTMENT OF AGRICULTURE - AGRICULTURAL RESEARCH SERVICE RESEARCH ON PEST BIOLOGY: WEEDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Over 125 permanent full-time scientists conduct research within ARS on issues related to weeds. The research emphasis of most of these scientists involves ecology and management or biological control of weeds. Many scientists perform research on weed biology as components of their primary projects o...

331

Residual Weeds of Processing Sweet Corn in the North Central Region  

Technology Transfer Automated Retrieval System (TEKTRAN)

Knowledge of weed community structure in vegetable crops of the North Central Region (NCR) is poor. To characterize weed composition of species persisting in sweet corn to harvest, hereafter called residual weeds, 175 sweet corn fields were surveyed in Illinois, Minnesota, and Wisconsin from 2005 to...

332

Evolution of Weediness and Invasiveness: Charting the Course for Weed Genomics  

E-print Network

Evolution of Weediness and Invasiveness: Charting the Course for Weed Genomics C. Neal Stewart, Jr and their evolution remain poorly understood, but genomic approaches offer tremendous promise for elucidating these important features of weed biology. However, the genomic tools and resources available for weed research

Rieseberg, Loren

333

Allelopathic potential of an annual weed, Polypogon monspeliensis , in crops in India  

Microsoft Academic Search

The question of whether annual weeds are allelopathic under natural conditions still remains to be critically answered. Investigations were carried out to understand the involvement and mode of operation of allelopathy in an annual weed, Polypogon monspeliensis. Comparative studies of soils associated with and without the weed under field conditions revealed that there was no significant difference in toxicity of

Inderjit; K. M. M. Dakshini

1995-01-01

334

Increase in toxicity of an invasive weed after reassociation with its coevolved herbivore  

Microsoft Academic Search

The ability of weeds to proliferate into nonindigenous habitats has been attributed to escape from their native natural enemies, allowing reallocation of resources from chemical defense into growth and reproduction. Many invasive weeds, however, eventually encounter their native, coevolved enemies in areas of introduction. Examination of herbarium specimens of an invasive phototoxic European weed, Pastinaca sativa, through 152 years reveals

Arthur R. Zangerl; May R. Berenbaum

2005-01-01

335

Changes in weed composition of winter wheat crops due to long-term fertilization  

Microsoft Academic Search

The effects of various fertilization levels on weed species composition and aboveground biomass were investigated in experimental plots of winter wheat established 14 years ago in Fengqiu, China. The treatments examined influenced weeds growth, the effects differing much between weed species. Arenaria serpyllifolia, Chorispora tenella, Erysimum cheiranthoides, and Veronica persica were best adapted either to N-, P-, K-deficiency or balanced

Lichu Yin; Zucong Cai; Wenhui Zhong

2005-01-01

336

The effect of environmental conditions on the seasonal dormancy pattern and germination of weed seeds  

Microsoft Academic Search

Weeds cause considerable losses in horticultural and agricultural crops. Weeds are still predominantly controlled with herbicides. To reduce the use of chemicals, a better understanding of the biology of weeds is required. In this thesis the effect of environmental conditions on dormancy and germination of Chenopodium album L., Polygonum persicaria L., P. lapathifolium L. subsp. lapathifolium, Sisymbrium officinale (L.) Scop.

H. J. Bouwmeester

1990-01-01

337

The Effect of Farmyard Manure Anaerobic Treatment on Weed Seed Viability  

Microsoft Academic Search

Weed encroachment is a serious problem of contemporary agriculture. Farmyard manure and other organic fertilizers can be major sources of weed seeds that get into the soil. One of the methods for eliminating weed seed germination is the technology of anaerobic treatment of the farmyard manure with a simultaneous production of biogas, the so called “Olomouc method”.Before anaerobic fermentation seeds

B. Šarapatka; M. Holub; M. Lhotská

1993-01-01

338

Management filters and species traits: Weed community assembly in long-term organic and conventional systems  

Technology Transfer Automated Retrieval System (TEKTRAN)

Community assembly theory provides a useful framework to assess the response of weed communities to agricultural management systems and to improve the predictive power of weed science. Under this framework, weed community assembly is constrained by abiotic and biotic "filters" that act on species tr...

339

Weed management practices for organic production of trailing blackberry. I. Plant growth and early fruit production  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed management practices were evaluated in a new field of trailing blackberry established in western Oregon. The field was planted in May 2010 and certified organic in May 2012. Treatments included two cultivars, ‘Marion’ and ‘Black Diamond’, grown in 1) non-weeded plots, where weeds were cut to th...

340

South Carolina Pest Management Handbook for Field Crops -2014 WEED CONTROL IN COTTON  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2014 70 WEED CONTROL IN COTTON Mike Marshall, Extension Weed Specialist Preplant Burndown Herbicides for Weed Management in Cotton Herbicide is required before cotton planting. In general, CLARITY is less effective than 2,4-D LVE on cutleaf

Duchowski, Andrew T.

341

South Carolina Pest Management Handbook for Field Crops -2013 WEED CONTROL IN COTTON  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2013 63 WEED CONTROL IN COTTON Mike Marshall, Extension Weed Specialist Preplant Burndown Herbicides for Weed Management in Cotton Herbicide is required before cotton planting. In general, CLARITY is less effective than 2,4-D LVE on cutleaf

Stuart, Steven J.

342

Lawn Weed Control with Herbicides. Home and Garden Bulletin No. 123.  

ERIC Educational Resources Information Center

Information and diagrams are given for identification and treatment of weed grasses and broadleaf weeds. Herbicides are suggested for use against each weed and instructions are given for proper application. Information is given for buying herbicides, and applying sprays and cleaning sprayers. (BB)

Agricultural Research Service (USDA), Washington, DC.

343

Organic Highbush Blueberry Production Systems Research – Management of Plant Nutrition, Irrigation Requirements, and Weeds  

Technology Transfer Automated Retrieval System (TEKTRAN)

A 0.4 ha planting of blueberry was established in October 2006 to evaluate the effects of cultivar (Duke and Liberty), bed type (flat versus raised beds), weed management (sawdust mulch and hand-weed control; sawdust+compost mulch with acetic acid, flaming, and hand control used as needed; and weed ...

344

Potential synergistic effects of cereal rye biomass and soybean planting density on weed suppression  

Technology Transfer Automated Retrieval System (TEKTRAN)

Increasing crop density is a cultural weed management practice that can complement the use of cover crops for weed suppression. In this research, we created a range of cover crop biomass and soybean densities in order to assess their weed suppressive ability alone and in combination. The experiment ...

345

11:776:402 Weeds: Impact & Management in Urban Landscapes (WIMUL) (3 credits)  

E-print Network

and orchards; nurseries (field & container); recreation areas including agro-tourism centers and parks;09/25/12: Weed management methods Part 1: Non-chemical methods 10/02/12: Weed management methods Part 2: Chemical agro-tourism centers and parks 11/13/12: Exam 2. Module 3: Weed Management Options in Urban Landscape

Chen, Kuang-Yu

346

Weed populations and crop rotations : Exploring dynamics of a structured periodic system  

Microsoft Academic Search

The periodic growing of a certain set of crops in a prescribed order, called a crop rotation, is considered to be an important tool for managing weed populations. Nevertheless, the effects of crop rotations on weed population dynamics are not well understood. Explanations for rotation effects on weed populations usually invoke the diversity of environments caused by different crops that

Shana K. Mertens; Frank van den Bosch

2002-01-01

347

Decomposition dynamics of invasive alligator weed compared with native sedges in a Northland lake  

Microsoft Academic Search

Invasive weeds have been shown to alter ecosystem processes such as decomposition and nutrient cycling. However, little is known about the effects of introduced biocontrol agents on these processes. This study examined the effects of alligator weed (Alternanthera philoxeroides) and its biocontrol agent, the alligator weed flea beetle (Agasicles hygrophila), on nutrient cycling in a northern New Zealand lake. Alligator

Imogen E. Bassett; Jacqueline R. Beggs; Quentin Paynter

2010-01-01

348

Seed Production as Influenced by Glyphosate Applications Across a Weed Community  

Technology Transfer Automated Retrieval System (TEKTRAN)

Late-season weed infestations often do not affect yields and are allowed to mature and contribute seed to the soil seedbank, ensuring the future establishment of competitive weed communities. Effective long-term weed management strategies must incorporate practices to reduce the soil seedbank by re...

349

South Carolina Pest Management Handbook for Field Crops -2014 WEED CONTRL IN FIELD CORN  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2014 18 WEED CONTRL IN FIELD CORN Mike Marshall, Extension Weed Specialist Preplant/Burndown Herbicides for Weed Management in Corn to planting corn. Use 16 oz/A rate on medium to fine texture soils with >2.5% organic matter. Use 8 oz/A rate

Duchowski, Andrew T.

350

Sweat, Brain-Power, Horsepower, and Time - The Keys to Controlling Weeds  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in organic crop production is difficult and costly. Early studies on organic weed control in conservation tillage systems were disappointing. Research shifted to organic weed control in conventional tillage systems. Intense cultivation with a tine weeder was the most consistent metho...

351

Broadcast application of Racer for broadleaf weed control in spring-transplanted onions  

Technology Transfer Automated Retrieval System (TEKTRAN)

Controlling weeds can be a costly and time consuming process and uncontrolled weeds can reduce or eliminate crop yields and profits. In conventional agriculture, the use of herbicides provides a valuable tool within an integrated weed control system, but there are very few organically approved her...

352

South Carolina Pest Management Handbook for Field Crops -2013 WEED CONTRL IN FIELD CORN  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2013 17 WEED CONTRL IN FIELD CORN Mike Marshall, Extension Weed Specialist Preplant/Burndown Herbicides for Weed Management in Corn to planting corn. Use 16 oz/A rate on medium to fine texture soils with >2.5% organic matter. Use 8 oz/A rate

Stuart, Steven J.

353

Sago (Metroxylon sagu Rottb.) growth is affected by weeds in a tropical peat swamp in Thailand  

Microsoft Academic Search

The effect of weeds on sago palms (Metroxylon sagu Rottb.) growing in tropical peat soils was examined in the field and in pots. In the field, 31 species of weeds were found, however, Fimbristylis umbellaris (Cyperraceae) and Leersia hexandra (Gramineae) were the most abundant species. Sago heights and weed populations seemed to be correlated. The field experiment showed that high

Monrawee Yanbuaban; Mitsuru Osaki; Tanit Nuyim; Jumpen Onthong; Toshihiro Watanabe

2007-01-01

354

www.btny.purdue.edu/weedscience/ Nitrogen Accumulation by Annual Grass Weeds  

E-print Network

-atrazine premixes to those that are less reliant on the premixes and more reliant on postemergence glyphosate was to determine the interactive effects of grass weed interference and sid-dressed N applications on corn and weed weeds emerged at about the same time or slightly later than the corn and were controlled with glyphosate

Ginzel, Matthew

355

The Art and the Science of Cultivation for Weed Control in Organic Peanut  

Technology Transfer Automated Retrieval System (TEKTRAN)

Cultural weed control is the basis on which an integrated system of weed management in organic peanut is based. The cultural practices evaluated for weed control were row patterns and seeding rates, integrated with cultivation intensity. Results showed that peanut seeded in wide rows (two rows, 91...

356

Yield loss prediction for integrated weed management in direct?seeded rice  

Microsoft Academic Search

The critical period of rice?weed competition was studied for the rice varieties Oryzica 1 and CICA 8, in 1989 and 1990. Weed species were Eleusine indca, Echinochloa crus?galli, Echinochloa colonum, Cyperus difformis, Cyperus esculentus, Cyperus iria, Leptochloa filiformis and Eclipta alba. Competition effects were similar for both varieties. Weeds emerging with the crop were the most damaging ones. Rice yields

A. J. Fischer; J. Lozano; A. Ramirez; L. R. Sanint

1993-01-01

357

On the adequacy of GIS-generated weed maps for Precision Farming  

E-print Network

On the adequacy of GIS-generated weed maps for Precision Farming Matthias Backes1 , Lutz Plümer1 1 an increasing importance in modern Precision Farming. For the application of herbicides in a field, maps of weed reason why farmers tend to be hesitant in applying the GIS-generated weed maps. In this paper, the lack

Behnke, Sven

358

7 CFR 201.65 - Noxious weed seeds in interstate commerce.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2010-01-01 false Noxious weed seeds in interstate commerce. 201...REGULATIONS Tolerances § 201.65 Noxious weed seeds in interstate commerce. Tolerances for rates of occurrence of noxious-weed seeds shall be recognized and shall...

2010-01-01

359

NEW YORK WEED SCIENCE FIELD DAY -2013 JULY 17 -WEDNESDAY H. C. THOMPSON RESEARCH FARM  

E-print Network

NEW YORK WEED SCIENCE FIELD DAY - 2013 JULY 17 - WEDNESDAY ­ H. C. THOMPSON RESEARCH FARM Freeville a formal Weed Science Field Day at the H. C. Thompson Research Farm this year. If you want to see:30 p.m. Registration 1:30 - 4:30 p.m. Field Crop Weed Control (Russ Hahn) CCA and DEC Credits have been

Keinan, Alon

360

7 CFR 201.65 - Noxious-weed seeds in interstate commerce.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 2012-01-01 false Noxious-weed seeds in interstate commerce. 201...REGULATIONS Tolerances § 201.65 Noxious-weed seeds in interstate commerce. Tolerances for rates of occurrence of noxious-weed seeds shall be recognized and shall...

2012-01-01

361

7 CFR 360.301 - Information required for applications for permits to move noxious weeds.  

Code of Federal Regulations, 2014 CFR

...applications for permits to move noxious weeds. 360.301 Section 360.301 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.301 Information...applications for permits to move noxious weeds. (a) Permit to import a noxious...

2014-01-01

362

7 CFR 360.301 - Information required for applications for permits to move noxious weeds.  

Code of Federal Regulations, 2013 CFR

...applications for permits to move noxious weeds. 360.301 Section 360.301 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.301 Information...applications for permits to move noxious weeds. (a) Permit to import a noxious...

2013-01-01

363

WEED CONTROL IN FLUE-CURED TOBACCO Charles S. Johnson, Extension Plant Pathologist, Tobacco  

E-print Network

WEED CONTROL IN FLUE-CURED TOBACCO Charles S. Johnson, Extension Plant Pathologist, Tobacco Good weed control uses crop rotation, early root and stalk destruction, cultivation, and appropriate use) will reduce reliance on tillage and cultivation for early season weed control. Some herbicides may also

Buehrer, R. Michael

364

WEED MANAGEMENT IN SHELTERBELTS IS important as unwanted plants can compete for moisture,  

E-print Network

WEED MANAGEMENT IN SHELTERBELTS IS important as unwanted plants can compete for moisture, nutrients and light. Unmanaged shelterbelts can also serve as a source of weed propagules into surrounding habitats. If weeds are not properly managed they can reduce the growth and survival of desirable species in recently

Maxwell, Bruce D.

365

Linkages among agronomic, environmental and weed management characteristics in North American sweet corn  

E-print Network

Linkages among agronomic, environmental and weed management characteristics in North American sweet-Agricultural Research Service, Invasive Weed Management Unit, 1102 S. Goodwin Ave., Urbana, IL 61801, USA b General practices and species interactions (Harper, 1977). In agroecosystems, knowledge of weed community structure

Sims, Gerald K.

366

Cooperative Coevolutionary Invasive Weed Optimization and its Application to Nash Equilibrium Search in Electricity Markets  

E-print Network

Cooperative Coevolutionary Invasive Weed Optimization and its Application to Nash Equilibrium and Intelligent Processing Center of Excellence University of Tehran, Iran Philosophy · Why Weeds? ·The most robust and troublous plant in agriculture. ·After thousands of tillage and hand-weeding we still have

Zhang, Richard "Hao"

367

Weed Seed Survival in Livestock Systems Jeanie Katovich and Roger Becker  

E-print Network

Weed Seed Survival in Livestock Systems Jeanie Katovich and Roger Becker Department of Agronomy to the soil. However, many assume manure is always rich in weed seeds. The opposite is probably the case as most of our harvested forage is relatively free of weed seeds. Exceptions obviously exist

Minnesota, University of

368

South Carolina Pest Management Handbook for Field Crops -2013 GRASS FORAGE WEED CONTROL  

E-print Network

South Carolina Pest Management Handbook for Field Crops - 2013 116 GRASS FORAGE WEED CONTROL Mike Marshall, Extension Weed Specialist Newly Sprigged Bermudagrass Herbicide Rate/Acre Broadcast Mode: Apply OUTRIDER at 1.33 oz/A to control johnsongrass, yellow and purple nutsedge, and other weeds

Stuart, Steven J.

369

Integration of soil, crop and weed management in low-external-input farming systems  

E-print Network

Integration of soil, crop and weed management in low-external-input farming systems M LIEBMAN diversi®cation are basic components of LEI systems. Weed scientists can improve the use of these practices for weed management by improving knowledge of four relevant ecological mechanisms. First, multispecies crop

Sims, Gerald K.

370

Managing Weeds in Dry Peas Agronomic and market considerations have sparked an  

E-print Network

Managing Weeds in Dry Peas Agronomic and market considerations have sparked an increased interest in incorporating dry peas into their crop rotation should be aware of the associated weed management challenges to inadequate weed management. For example, a wild oat density of 4 plants/ft2 can lead to a 51 percent loss

Maxwell, Bruce D.

371

7 CFR 360.301 - Information required for applications for permits to move noxious weeds.  

Code of Federal Regulations, 2011 CFR

...applications for permits to move noxious weeds. 360.301 Section 360.301 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.301 Information...applications for permits to move noxious weeds. (a) Permit to import a noxious...

2011-01-01

372

Managing Weed Escapes in Roundup Ready Corn By Jeffrey L. Gunsolus  

E-print Network

Managing Weed Escapes in Roundup Ready Corn By Jeffrey L. Gunsolus Professor and Extension Agronomist ­ Weed Science University of Minnesota Introduction Soybean producers have rapidly adopted as an easier method of conducting weed management. Currently, glyphosate and glufosinate are the key herbicide

Minnesota, University of

373

7 CFR 360.301 - Information required for applications for permits to move noxious weeds.  

Code of Federal Regulations, 2012 CFR

...applications for permits to move noxious weeds. 360.301 Section 360.301 Agriculture...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.301 Information...applications for permits to move noxious weeds. (a) Permit to import a noxious...

2012-01-01

374

Effects of Weed Resistance Concerns and Resistance Management Practices on the Value of Roundup Ready Crops  

E-print Network

Effects of Weed Resistance Concerns and Resistance Management Practices on the Value of Roundup-commercial purposes by any means, provide that this copyright notice appears on all such copies. #12;1 Effects of Weed Tucson, AZ Abstract This study estimates grower benefits of Roundup-Ready® (RR) weed management programs

Mitchell, Paul D.

375

7 CFR 201.65 - Noxious weed seeds in interstate commerce.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 2011-01-01 false Noxious weed seeds in interstate commerce. 201...REGULATIONS Tolerances § 201.65 Noxious weed seeds in interstate commerce. Tolerances for rates of occurrence of noxious-weed seeds shall be recognized and shall...

2011-01-01

376

Data Weeding Techniques Applied to Roget's Thesaurus Uta Priss, L. John Old  

E-print Network

Data Weeding Techniques Applied to Roget's Thesaurus Uta Priss, L. John Old Napier University- riety of "data weeding" techniques that can be applied in order to reduce the size of a concept lattice about which data to select resemble a form of "weeding" in a garden because whether a plant

Old, L. John

377

7 CFR 201.65 - Noxious-weed seeds in interstate commerce.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Noxious-weed seeds in interstate commerce. 201...REGULATIONS Tolerances § 201.65 Noxious-weed seeds in interstate commerce. Tolerances for rates of occurrence of noxious-weed seeds shall be recognized and shall...

2013-01-01

378

Direct and Indirect Impacts of Weed Management Practices on Soil Quality  

E-print Network

275 18 Direct and Indirect Impacts of Weed Management Practices on Soil Quality Richard G. Smith, Matthew R. Ryan, and Fabian D. Menalled Weed management is an ever-present challenge to crop production. Weeds have the poten- tial to usurp resources that would otherwise provide nourishment to growing crops

Maxwell, Bruce D.

379

RESEARCH ARTICLE Remarkable changes of weed species in Spanish cereal fields  

E-print Network

RESEARCH ARTICLE Remarkable changes of weed species in Spanish cereal fields from 1976 to 2007 gradients and climatic factors are factors explaining weed species composition and richness in cereal fields from Northern and Central Europe. In the Mediterranean area, the precise factors responsible for weed

Paris-Sud XI, Université de

380

Influence of Planting Date and Weed Interference on Sweet Corn Growth and Development  

E-print Network

Influence of Planting Date and Weed Interference on Sweet Corn Growth and Development Martin M- tween weeds and sweet corn (Zea mays L.); however, little is known about sweet corn growth response to weed interference. Field studies were conducted in 2004 and 2005 near Urbana, IL, to quantify

Sims, Gerald K.

381

7 CFR 201.65 - Noxious-weed seeds in interstate commerce.  

Code of Federal Regulations, 2014 CFR

...2014-01-01 2014-01-01 false Noxious-weed seeds in interstate commerce. 201...REGULATIONS Tolerances § 201.65 Noxious-weed seeds in interstate commerce. Tolerances for rates of occurrence of noxious-weed seeds shall be recognized and shall...

2014-01-01

382

Email not displaying correctly? View it in your browser. Mobile Weed Manual is Here!  

E-print Network

Email not displaying correctly? View it in your browser. Mobile Weed Manual is Here! The University of Tennessee Turf & Ornamental Weed Science Team has put together a new website and free mobile app called "Mobile Weed Manual," #12;located at www.mobileweedmanual.com. It just went online this week

Tennessee, University of

383

TWIN-ROW SPACING DOES NOT AFFECT WEED FREE CRITICAL PERIOD IN CONSERVATION-TILLAGE CORN.  

Technology Transfer Automated Retrieval System (TEKTRAN)

The critical period for weed control is the crop growth stage when weeds must be controlled to prevent cash crop yield losses. Field trials were conducted at the E.V. Smith Research and Extension Center near Shorter, AL, in 2004 and 2005 to compare the critical period for weed control in twin (19 c...

384

Smoking the Other: marijuana and counterhegemony in Weeds.  

PubMed

Subverting suburban modernity, the SHOWTIME television series Weeds invites its audiences to situate their opinions about marijuana amid spheres of bourgeois soccer-moms, class politics, turf wars, raw economics, violent milieux, and multiculti heterogeneity. I argue that Weeds encourages us to "smoke the Other"; that is, to hesitantly accept difference, in line with many drug circles' etiquette. The phrase "smoking the Other" is a critical alteration of bell hooks' (1992, Black looks: Race and representation. Boston: South End Press) conception of whites' ethnic "devouring" as "eating the Other," a rather rigid schematic itself problematized by Weeds' transgressive self-conscious playfulness with stereotyped ethnicities, loopy plotlines, and counterhegemonic dialogue. Cultural/political implications follow. PMID:21599507

Lavoie, Dusty

2011-01-01

385

Image classification approach for automatic identification of grassland weeds  

NASA Astrophysics Data System (ADS)

The potential of digital image processing for weed mapping in arable crops has widely been investigated in the last decades. In grassland farming these techniques are rarely applied so far. The project presented here focuses on the automatic identification of one of the most invasive and persistent grassland weed species, the broad-leaved dock (Rumex obtusifolius L.) in complex mixtures of grass and herbs. A total of 108 RGB-images were acquired in near range from a field experiment under constant illumination conditions using a commercial digital camera. The objects of interest were separated from the background by transforming the 24 bit RGB-images into 8 bit intensities and then calculating the local homogeneity images. These images were binarised by applying a dynamic grey value threshold. Finally, morphological opening was applied to the binary images. The remaining contiguous regions were considered to be objects. In order to classify these objects into 3 different weed species, a soil and a residue class, a total of 17 object-features related to shape, color and texture of the weeds were extracted. Using MANOVA, 12 of them were identified which contribute to classification. Maximum-likelihood classification was conducted to discriminate the weed species. The total classification rate across all classes ranged from 76 % to 83 %. The classification of Rumex obtusifolius achieved detection rates between 85 % and 93 % by misclassifications below 10 %. Further, Rumex obtusifolius distribution and the density maps were generated based on classification results and transformation of image coordinates into Gauss-Krueger system. These promising results show the high potential of image analysis for weed mapping in grassland and the implementation of site-specific herbicide spraying.

Gebhardt, Steffen; Kühbauch, Walter

2006-08-01

386

Phenological observations on shrubs to predict weed emergence in turf  

NASA Astrophysics Data System (ADS)

Phenology is the study of periodic biological events. If we can find easily recognizable events in common plants that precede or coincide with weed emergences, these plants could be used as indicators. Weed seedlings are usually difficult to detect in turf, so the use of phenological indicators may provide an alternative approach to predict the time when a weed appears and consequently guide management decisions. A study was undertaken to determine whether the phenological phases of some plants could serve as reliable indicators of time of weed emergence in turf. The phenology of six shrubs (Crataegus monogyna Jacq., Forsythia viridissima Lindl., Sambucus nigra L., Syringa vulgaris L., Rosa multiflora Thunb., Ziziphus jujuba Miller) and a perennial herbaceous plant [Cynodon dactylon (L.) Pers.] was observed and the emergence dynamics of four annual weed species [Digitaria sanguinalis (L.) Scop., Eleusine indica (L.) Gaertner, Setaria glauca (L.) Beauv., Setaria viridis (L.) Beauv.] were studied from 1999 to 2004 in northern Italy. A correlation between certain events and weed emergence was verified. S. vulgaris and F. viridissima appear to be the best indicators: there is a quite close correspondence between the appearance of D. sanguinalis and lilac flowering and between the beginning of emergence of E. indica and the end of lilac flowering; emergences of S. glauca and S. viridis were predicted well in relation to the end of forsythia flowering. Base temperatures and starting dates required to calculate the heat unit sums to reach and complete the flowering phase of the indicators were calculated using two different methods and the resultant cumulative growing degree days were compared.

Masin, Roberta; Zuin, Maria Clara; Zanin, Giuseppe

2005-09-01

387

Phenological observations on shrubs to predict weed emergence in turf.  

PubMed

Phenology is the study of periodic biological events. If we can find easily recognizable events in common plants that precede or coincide with weed emergences, these plants could be used as indicators. Weed seedlings are usually difficult to detect in turf, so the use of phenological indicators may provide an alternative approach to predict the time when a weed appears and consequently guide management decisions. A study was undertaken to determine whether the phenological phases of some plants could serve as reliable indicators of time of weed emergence in turf. The phenology of six shrubs (Crataegus monogyna Jacq., Forsythia viridissima Lindl., Sambucus nigra L., Syringa vulgaris L., Rosa multiflora Thunb., Ziziphus jujuba Miller) and a perennial herbaceous plant [Cynodon dactylon (L.) Pers.] was observed and the emergence dynamics of four annual weed species [Digitaria sanguinalis (L.) Scop., Eleusine indica (L.) Gaertner, Setaria glauca (L.) Beauv., Setaria viridis (L.) Beauv.] were studied from 1999 to 2004 in northern Italy. A correlation between certain events and weed emergence was verified. S. vulgaris and F. viridissima appear to be the best indicators: there is a quite close correspondence between the appearance of D. sanguinalis and lilac flowering and between the beginning of emergence of E. indica and the end of lilac flowering; emergences of S. glauca and S. viridis were predicted well in relation to the end of forsythia flowering. Base temperatures and starting dates required to calculate the heat unit sums to reach and complete the flowering phase of the indicators were calculated using two different methods and the resultant cumulative growing degree days were compared. PMID:15846520

Masin, Roberta; Zuin, Maria Clara; Zanin, Giuseppe

2005-09-01

388

Competitive effects of introduced annual weeds on some native and reclamation species in the Powder River Basin, Wyoming  

Microsoft Academic Search

Four experiments were conducted to examine the competitive effects of introduced annual weeds on certain native and reclamation species. The first experiment was initiated by discing three sites in the Powder River Basin, Wyoming, at three distances from introduced weed seed sources. Introduced weed colonization was greatest when a seed source was located nearby. Higher weed cover resulted in reductions

E. B. Allen; D. H. Knight

1980-01-01

389

Modeling "habitat suitability" for a herbicide resistant weed using a species distribution model and presence-only data  

Technology Transfer Automated Retrieval System (TEKTRAN)

Herbicide resistant weeds are like invasive weeds: prompt management is needed to prevent their spread. For invasive weeds, first reports of a weed's occurrence are often analyzed with species distribution models (SDM) to prioritize detection and treatment. Suitability of other areas as habitat for ...

390

Combinations of corn glutel meal, clove oil, and sweep cultivation are ineffective for weed control in organic peanut production  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in organic peanut is difficult and lack of residual weed control complicates weed management efforts. Weed management systems using corn gluten meal in combination with clove oil and sweep cultivation were evaluated in a series of irrigated field trials. Corn gluten meal applied in a ...

391

The effect of tillage intensity and time of herbicide application on weed communities and populations in maize in central Europe  

Microsoft Academic Search

Soil-conserving cropping systems aim at reducing tillage intensity to decrease soil erosion, leaching of nitrate and pesticides, and production costs. They are, therefore, likely to change the efficiency of weed control and hence weed populations. There is a lack of information on how reduced tillage systems, especially no-tillage (NT), affect the development of weed populations and the efficiency of weed

Bernhard Streit; Stephanie B Rieger; Peter Stamp; Walter Richner

2002-01-01

392

Herbicide-resistant crops: utilities and limitations for herbicide-resistant weed management.  

PubMed

Since 1996, genetically modified herbicide-resistant (HR) crops, particularly glyphosate-resistant (GR) crops, have transformed the tactics that corn, soybean, and cotton growers use to manage weeds. The use of GR crops continues to grow, but weeds are adapting to the common practice of using only glyphosate to control weeds. Growers using only a single mode of action to manage weeds need to change to a more diverse array of herbicidal, mechanical, and cultural practices to maintain the effectiveness of glyphosate. Unfortunately, the introduction of GR crops and the high initial efficacy of glyphosate often lead to a decline in the use of other herbicide options and less investment by industry to discover new herbicide active ingredients. With some exceptions, most growers can still manage their weed problems with currently available selective and HR crop-enabled herbicides. However, current crop management systems are in jeopardy given the pace at which weed populations are evolving glyphosate resistance. New HR crop technologies will expand the utility of currently available herbicides and enable new interim solutions for growers to manage HR weeds, but will not replace the long-term need to diversify weed management tactics and discover herbicides with new modes of action. This paper reviews the strengths and weaknesses of anticipated weed management options and the best management practices that growers need to implement in HR crops to maximize the long-term benefits of current technologies and reduce weed shifts to difficult-to-control and HR weeds. PMID:20586458

Green, Jerry M; Owen, Micheal D K

2011-06-01

393

Herbicide-Resistant Crops: Utilities and Limitations for Herbicide-Resistant Weed Management  

PubMed Central

Since 1996, genetically modified herbicide-resistant (HR) crops, particularly glyphosate-resistant (GR) crops, have transformed the tactics that corn, soybean, and cotton growers use to manage weeds. The use of GR crops continues to grow, but weeds are adapting to the common practice of using only glyphosate to control weeds. Growers using only a single mode of action to manage weeds need to change to a more diverse array of herbicidal, mechanical, and cultural practices to maintain the effectiveness of glyphosate. Unfortunately, the introduction of GR crops and the high initial efficacy of glyphosate often lead to a decline in the use of other herbicide options and less investment by industry to discover new herbicide active ingredients. With some exceptions, most growers can still manage their weed problems with currently available selective and HR crop-enabled herbicides. However, current crop management systems are in jeopardy given the pace at which weed populations are evolving glyphosate resistance. New HR crop technologies will expand the utility of currently available herbicides and enable new interim solutions for growers to manage HR weeds, but will not replace the long-term need to diversify weed management tactics and discover herbicides with new modes of action. This paper reviews the strengths and weaknesses of anticipated weed management options and the best management practices that growers need to implement in HR crops to maximize the long-term benefits of current technologies and reduce weed shifts to difficult-to-control and HR weeds. PMID:20586458

2010-01-01

394

Host Status of Seven Weed Species and Their Effects on Ditylenchus destructor Infestation of Peanut.  

PubMed

The host suitability to Ditylenchus destructor of seven common weed species in peanut (Arachis hypogaea) fields in South Africa was determined. Based on the number of nematodes per root unit, white goosefoot (Chenopodium album), feathertop chloris (Chloris virgata), purple nutsedge (Cyperus rotundus), jimson weed (Datura stramonium), goose grass (Eleusine indica), khaki weed (Tagetes minuta), and cocklebur (Xanthium strumarium) were poor hosts. Ditylenchus destructor survived on all weed species; population densities increased in peanut hulls and caused severe damage to seeds of peanut grown after weeds. Roots of purple nutsedge left in the soil suppressed populations of D. destructor and root and pod development in peanut grown after the weed. However, nematode populations in peanut hulls and seeds were not suppressed. Some weed species, especially purple nutsedge which is common in peanut fields, can be used to indicate the presence of D. destructor in the absence of peanut. PMID:19287723

De Waele, D; Jordaan, E M; Basson, S

1990-07-01

395

Biology, ecology and management of the invasive parthenium weed (Parthenium hysterophorus L.).  

PubMed

Parthenium weed (Parthenium hysterophorus L.) is one of the most aggressive invasive weeds, threatening natural ecosystems and agroecosystems in over 30 countries worldwide. Parthenium weed causes losses of crops and pastures, degrading the biodiversity of natural plant communities, causing human and animal health hazards and resulting in serious economic losses to people and their interests in many countries around the globe. Several of its biological and ecological attributes contribute towards its invasiveness. Various management approaches (namely cultural, mechanical, chemical and biological control) have been used to minimise losses caused by this weed, but most of these approaches are ineffective and uneconomical and/or have limitations. Although chemical control using herbicides and biological control utilising exotic insects and pathogens have been found to contribute to the management of the weed, the weed nevertheless remains a significant problem. An integrated management approach is proposed here for the effective management of parthenium weed on a sustainable basis. PMID:24430973

Adkins, Steve; Shabbir, Asad

2014-07-01

396

Spatio-temporal variations of aquatic weeds abundance and coverage in Lake Chivero, Zimbabwe  

NASA Astrophysics Data System (ADS)

Information on the spatial distribution of aquatic weeds is required for understanding the evolution of weed invasion and propagation rates. Such information is also vital for identifying affected areas and relating weed abundance to probable changes in environmental conditions and human actions including management practices within the lake and its catchment. Information on aquatic weed distribution also assists in evaluating the effectiveness of control measures and management actions. In Zimbabwe, Lake Chivero has been characterised by aquatic weed proliferation since the 1970s. Field surveys done between December 2005 and March 2006 showed concentrations of 1.2 mg/l and 0.3 mg/l up from 0.3 mg/l and 0.03 mg/l in 2001 for phosphates and nitrates respectively. Proliferation of aquatic weeds will continue unless nutrient loadings to this lake are reduced. The aim of this paper was to assess the feasibility of mapping the spatial extent and abundance of aquatic weeds in Lake Chivero, Zimbabwe using Landsat images. Landsat images of 1976, 1989 and 2000 were used to calculate the normalised difference vegetation index (NDVI) which was used for estimating the spatial extent of aquatic weeds and weed biomass. Field data and actual biomass measurements were obtained between December 2005 and March 2006 by harvesting weeds from the lake. This was subsequently related to NDVI and used to estimate the abundance of the different weed species. The results indicate that the weed coverage in Lake Chivero declined from 42% in 1976, 36% in 1989 to 22% in 2000. The research also demonstrated that Typha capensis has more biomass, 11.1kg per square metre, than any other weed type and hence higher abundance in all the years. It was concluded that remote sensing is an invaluable asset for detection of invasions, assessment of infestation levels, monitoring rate of spread, and determining the efficacy of weed mitigation measures.

Shekede, M. D.; Kusangaya, S.; Schmidt, K.

397

ALLELOPATHIC EFFECTS OF DOPA AGAINST FOUR WEED SPECIES  

Microsoft Academic Search

Dopa is a natural product of some plants such as velvetbean. Its herbicidal effects on weed species; wild mustard (Sinapis arvensis), creeping thistle (Cirsium arvense), field poppy (Papaver rhoeas) and henbit (Lamium amplexicaule) were investigated using wheat (Triticum vulgare) and barley (Hordeum vulgare) species as control plants. Dopa showed suppressive herbicidal effect at 1500 and 3000 mg\\/l concentrations on the

Süleyman TOPAL

398

Confused about Fusion? Weed Your Science Collection with a Pro.  

ERIC Educational Resources Information Center

Provides guidelines on weeding science collections in junior high/high school libraries. Highlights include checking copyright dates, online sources, 13 science subject areas that deserve special consideration (plate tectonics, fission, fusion, radioactive dating, weather/climate, astronomy/space science, elements, integrated science,…

O'Dell, Charli

1998-01-01

399

Onion and weed response to mustard (Sinapis alba) seed meal  

Technology Transfer Automated Retrieval System (TEKTRAN)

Onion and weed response to mustard seed meal (MSM) were tested in greenhouse and field trials in 2007-2009. MSM was applied to the soil surface at rates of 1.1, 2.2, and 4.4 MT/ha. In greenhouse trials, onions were severely injured and stands reduced with all rates of MSM applied prior to onion emer...

400

Potential of Air-Propelled Abrasives for Selective Weed Control  

Technology Transfer Automated Retrieval System (TEKTRAN)

Novel forms of selective weed control are needed by many types of growers, but especially organic growers who are restricted from using synthetic herbicides. Abrasive grit made from corn cobs was expelled from a sand blaster at 517 kPa pressure and aimed at seedlings of common lambsquarters and corn...

401

Weed Control with Methyl Bromide Alternatives: A Review.  

Technology Transfer Automated Retrieval System (TEKTRAN)

Methyl bromide (MeBr) has been used for several decades for pre-plant soil fumigation in high value agricultural and horticultural crops because it can provide broad-spectrum control of insects, nematodes, pathogens, and weeds. However, MeBr has been identified as a powerful ozone-depleting chemica...

402

NEW DEVELOPMENTS IN THE BIOLOGICAL CONTROL OF INVASIVE WEEDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Six insects attacking yellow starthistle are widespread in California's central valley but have not substantially reduced weed populations. The accidentally introduced, false peacock fly is now widespread, but appears to pose no risk to native Cirsium thistles and negligible risk to safflower produ...

403

Integrated dryland weed control in nature farming systems  

Microsoft Academic Search

As practices of integrated weed control in nature farming systems, surface application of a bioactive organic fertilizer, pigtailed wheat straw mulch, and intercropped peanut as a smother crop were tested with soybean, Japanese pumpkin and tomato, respectively. A bioactive organic fertilizer using rice bran, oil mill sludge and fish meal as materials and a microbial inoculant (EM as its commercial

Hui-lian Xu; Feifei Qin; Fahong Wang; Qicong Xu; Shailendra K. Shah; Fengmin Li

2009-01-01

404

Crop Tolerance to Weeds is Influenced by Preceding Crop  

Technology Transfer Automated Retrieval System (TEKTRAN)

Cropping systems in the Great Plains of the United States are changing because of no-till. Rotations now include a diversity of crops in contrast with rotations in tilled systems that grow only one or two crops. This change in rotation design has enabled producers to develop population-based weed ...

405

The biology of Canadian weeds. 134. Bromus inermis Leyss  

E-print Network

The biology of Canadian weeds. 134. Bromus inermis Leyss R. Otfinowski1, N. C. Kenkel1, and P. M. Received 1 May 2006, accepted 29 August 2006 Otfinowski, R., Kenkel, N. C. and Catling, P. M. 2007, Canada distribution, alien, smooth brome, biological invasion Otfinowski, R., Kenkel, N. C. et Catling, P

Kenkel, Norm

406

Glyphosate resistant weeds - a threat to conservation agriculture  

Technology Transfer Automated Retrieval System (TEKTRAN)

Glyphosate-resistant weeds are now present throughout the Southeast. Hundreds of thousands of conservation tillage cotton acres, some currently under USDA Natural Resources Conservation Service (NRCS) conservation program contracts, are at risk of being converted to higher-intensity tillage systems....

407

Canada Goose Weed Dispersal and Nutrient Loading in Turfgrass Systems  

Microsoft Academic Search

High populations of Canada geese (Branta canadensis L.) can lead to feces accumulation in areas adjacent to surface waters, creating concern about aquatic eutrophication. Further, turf managers and livestock farmers work to keep their facilities free of noxious or toxic weeds that geese potentially disperse. We investigated the prevalence of viable seeds and nitrogen and phosphorus content in resident Canada

Christopher R. Ayers; Christopher S. DePerno; Christopher E. Moorman; Fred H. Yelverton

2010-01-01

408

Robust crop and weed segmentation under uncontrolled outdoor illumination  

Technology Transfer Automated Retrieval System (TEKTRAN)

A new machine vision for weed detection was developed from RGB color model images. Processes included in the algorithm for the detection were excessive green conversion, threshold value computation by statistical analysis, adaptive image segmentation by adjusting the threshold value, median filter, ...

409

Weed Killer Deforms Sex Organs in Frogs, Study Finds  

NSDL National Science Digital Library

This Web site discusses current research findings surrounding the use of the weed killer, atrazine, and sex organ deformities in frogs exposed to it. The article from the New York Times summarizes the recent research report; free registration is required to view it. This site reports focus on the potential impact of atrazine on humans, but they do raise it as an important question.

Associated Press.

410

[Spectrum analysis of crop and weeds at seedling].  

PubMed

The infestation information on field weeds is the basis of variable spraying herbicides. It was found that the method using the spectral characteristics of plant is superior in real-time respect. The Fourier transform infrared spectrum technique was applied to measure the reflectance of wheat and weeds in the range from 700 to 1100 nm. The discrimination analysis was done using the SPSS software. Firstly, the source spectrum data were compressed and normalized. Secondly, the characteristic wavelengths were selected by using stepwise method. Thirdly, the discrimination model was set up to use the selected wavelengths as the variables for detecting wheat and weeds. It was shown by the result of discrimination analysis that the correct classification rate of wheat and weeds detection with the selected wavelength points achieved 97%. In addition, the selected wavelength points were marked in the "red edge" of reflectance within some range, and the rate of correct classification increased with the increase in the numbers of the selected wavelength points. According to the selected wavelength points, the proper filters were chosen to perform the multi-spectral images captured and processed with the machine vision system. PMID:16201389

Mao, Wen-hua; Wang, Yue-qing; Wang, Yi-ming; Zhang, Xiao-chao

2005-06-01

411

Revegetation Guidelines for the Great Basin: Considering Invasive Weeds  

Technology Transfer Automated Retrieval System (TEKTRAN)

Large portions of the Great Basin become degraded and disturbed every day due to natural and human-induced causes. Some disturbed areas may recover naturally in time, but other areas may never recover naturally because invasive weeds establish quickly and prevent native plants from establishing. I...

412

WEED SEEDLING EMERGENCE AND MICROCLIMATE IN A TROPICAL ENVIRONMENT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Tropic ageratum (Ageratum conyzoides) is an important annual weed in tropical cropping systems. Better and more timely strategies for its control might be developed through a more thorough understanding of its emergence behavior. Seedling emergence of tropic ageratum was monitored periodically and s...

413

Organic weed control in certified organic watermelon production  

Technology Transfer Automated Retrieval System (TEKTRAN)

The increasing perception by consumers that organic food tastes better and is healthier continues to expand the demand for organically produced crops. Field research was conducted in southeast Oklahoma to determine the impact of organic production systems on weed control and watermelon (Citrullus l...

414

Weed Management with Diclosulam in Peanut (Arachis hypogaea) 1  

Microsoft Academic Search

Field experiments were conducted at three locations in North Carolina in 1998 and 1999 and one location in Virginia in 1998 to evaluate weed management systems in peanut. Treatments consisted of diclosulam alone preemergence (PRE), or diclosulam plus metolachlor PRE alone or followed by (fb) bentazon plus acifluorfen postemergence (POST). These systems were also com­ pared with commercial standards of

ANDREW J. PRICE; JOHN W. WILCUT; CHARLES W. SWANN

2002-01-01

415

AXXE® (Pelargonic acid) and Racer® (Ammonium Nonanoate): Weed control comparisons  

Technology Transfer Automated Retrieval System (TEKTRAN)

Although corn gluten meal has shown promise as an early-season pre-emergent organic herbicide in squash (Cucurbita pepo L.) production, any uncontrolled weeds can inflict serious yield reductions by the end of the growing season. Organic vegetable producers need additional organic herbicides that c...

416

RESPONSE OF SWEETPOTATO (IPOMOEA BATATAS) CULTIVARS TO WEED INTERFERENCE  

Technology Transfer Automated Retrieval System (TEKTRAN)

Two field experiments were conducted to assess how sweetpotato cultivars respond to weed interference. The first experiment included 11 sweetpotato cultivars and breeding clones with markedly different growth habits and canopy architecture. Over five repetitions of the experiment at two locations, a...

417

Effects of Soybean Seed Size on Weed Competition  

Technology Transfer Automated Retrieval System (TEKTRAN)

Organic soybean producers must rely on various, nonherbicidal tactics for weed management. Increased soybean seed size may be one method to increase the competitiveness of the soybean canopy. Soybean varieties Hutcheson, NC-Roy, and NC-Raleigh were separated into four or five seed size classes. Seed...

418

Managing weeds with a population-based approach  

Technology Transfer Automated Retrieval System (TEKTRAN)

No-till cropping systems are improving precipitation-use-efficiency, increasing land productivity, and restoring soil health in semiarid regions of the world. However, weed resistance, rising costs, and concern about environmental impacts are stimulating questions about the extensive reliance on he...

419

LIBERTY TOLERANT COTTON: WEED CONTROL AND CROP TOLERANCE Brent Burns  

E-print Network

LIBERTY TOLERANT COTTON: WEED CONTROL AND CROP TOLERANCE Brent Burns Texas Tech University Lubbock Acres planted with herbicide-tolerant cotton varieties have steadily increased since their introduction in 1995. Recently, the bar gene was introduced into Coker 312 cotton plants for tolerance to Liberty

Mukhtar, Saqib

420

Integrating Residual Herbicides into Corn and Soybean Weed Management  

E-print Network

Integrating Residual Herbicides into Corn and Soybean Weed Management Plans Jeffrey L. Gunsolus lambsquarters. However, one difference is an increase in frequency of herbicide-resistance in all, waterhemp and common lambsquarters. However, one difference is an increase in frequency of herbicide

Minnesota, University of

421

Weed Management in Alfalfa Stands Dr. Case R. Medlin  

E-print Network

the competi- tion and spread of many weeds in alfalfa. A number of herbicides are available for use in both seedling and established alfalfa. Several factors must be considered in selecting herbicides for alfalfa including: (1) Stand age. Many herbicides that are safe on established alfalfa cannot be used on seedling

422

Herbicide Leaching Column for a Weed Science Teaching Laboratory.  

ERIC Educational Resources Information Center

Presents an experiment which enables weed science students to observe first-hand the process of herbicide leaching in soils. Features of this technique which demonstrate the movement of herbicide within a column of soil are outlined. Diagrams are provided of the apparatus employed in the exercise. (ML)

Ahrens, W. H.

1986-01-01

423

An application of soft sets in weed identification  

Technology Transfer Automated Retrieval System (TEKTRAN)

Soft set theory is originally proposed as a general mathematical tool for dealing with uncertainties present in most of our real life. This study applied soft sets to improve low accuracy of weed identification caused by similar features. Firstly, three types of plant leaf features including shape, ...

424

REVEGETATION GUIDELINES FOR WESTERN MONTANA: CONSIDERING INVASIVE WEEDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Revegetation is a major method for managing areas seriously infested with invasive weeds because it can be used to establish a healthy plant community that is resistant to invasion. Objectives were to help improve revegetation success by providing practical concepts and effective methods to establis...

425

Weed Community and Glyphosate Management in Soybean Crops  

Technology Transfer Automated Retrieval System (TEKTRAN)

A concern to some conservationists is the loss of biodiversity of weedy plant species in the face of wide-spread adoption by farmers of transgenic crops that are resistant to broad-spectrum herbicides such as glyphosate. We studied weed biodiversity in both Argentina and the USA, the two countries w...

426

Weed control and canopy light management in blackberries  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in blackberries (Rubus spp.) is a serious problem for organic producers and those who wish to reduce their reliance on herbicides. At the southern limits of blackberry production, late season yields are reduced because of high day-time temperatures generated by solar irradiation and ot...

427

Weed control in blackberries using synthetic ground covers  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control in blackberries (Rubus spp.) is a serious problem for organic producers and those who wish to reduce their reliance on herbicides. Three landscape fabrics (Dewitt, Texel, and a white polyester weave) and one industrial grade white on black plastic were used in conjuction with newly pla...

428

Response of four sweet corn hybrids to weed management level.  

Technology Transfer Automated Retrieval System (TEKTRAN)

Planting no-till into cover crop residues left on the soil surface offers benefits of suppressing weeds, reducing soil erosion, and eliminating trips through the field. Adequate suppression of cover crops to prevent competition with the main crop can be challenging, particularly in organic systems w...

429

Organic Weed Control in White Lupin (Lupinus albus L.)  

Technology Transfer Automated Retrieval System (TEKTRAN)

Legumes such as white lupin (Lupinus albus L.) provide a valuable nitrogen source in organic agriculture. With organic farming becoming an increasing sector of US agriculture and white lupin interest increasing in the southeastern USA because winter hardy cultivars are available, non-chemical weed c...

430

Nitrogen, Water, Weeds and Applying Science to the Art of  

E-print Network

Nitrogen, Water, Weeds and Beetles: Applying Science to the Art of Vegetable Gardening 2009 LRES and Beans 6 2. Bait Cropping Experiment 14 3. Effects of mulching in a small scale vegetable garden 18 4 to reduce flea beetle damage, planting Mustard and Collard plants around Brassica greens. Intercropping

Maxwell, Bruce D.

431

Glufosinate treatment of weeds results in ammonia emission by plants  

Microsoft Academic Search

The herbicide glufosinate, which is also called phosphinothricin (PPT), is known to inhibit glutamine synthetase and thus causes a blockage of ammonium (re)assimilation in plants. The objective of the present study was to test whether application of this herbicide results in an ammonia volatilization from the plants and to quantify nitrogen loss via ammonia emission. Four different weed species (Chenopodium

Remy Manderscheid; Stefan Schaaf; Marie Mattsson; Jan K. Schjoerring

2005-01-01

432

STRATEGIES FOR THE USE OF NATURAL PRODUCTS FOR WEED MANAGEMENT  

Technology Transfer Automated Retrieval System (TEKTRAN)

Natural products have not been utilized as extensively for weed management as they have been for insect and plant pathogen management, but there are several notable successes such as glufosinate and the natural product-derived triketone herbicides. The two fundamental approaches to the use of natur...

433

Significance of Atrazine in Weed Management Systems of Sweet Corn  

Technology Transfer Automated Retrieval System (TEKTRAN)

Knowledge of weed management systems being used by sweet corn growers, including the role of atrazine in these systems, is poorly characterized. Management records of 175 fields throughout the major sweet corn production areas of the Midwest were surveyed from 2005 to 2007. Seventy-four percent of s...

434

A NOVEL BIOHERBICIDE FOR CONTROL OF GRASSY WEEDS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Pseudomonas spp. were isolated from the rhizosphere of Poa, Triticale, Triticum, Hordeum, and Lolium species. These bacterial isolates were initially screened for the ability of live cultures to cause stunting of the roots and shoots of young seedlings of the grassy weed known as annual bluegrass (...

435

Corn gluten meal: Application options for a weed control alternative  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control is a limiting factor in organic vegetable production. It has been reported that corn gluten meal (CGM) has preemergnce herbicide properties that may be useful in organic vegetable production. However, studies with CGM in vegetables are limited, in part due to the need for an effective m...

436

Performance of methyl bromide alternatives for weed control  

Technology Transfer Automated Retrieval System (TEKTRAN)

Numerous research trials were conducted over five years to evaluate potential alternatives to methyl bromide for control of a broad spectrum of soilborne pests, including nematodes, plant pathogenic fungi, and weeds. Trials were conducted at the field demonstration, experimental plot, greenhouse, an...

437

HYDRILLA, THE PERFECT AQUATIC WEED, BECOMES MORE NOXIOUS THAN EVER  

Technology Transfer Automated Retrieval System (TEKTRAN)

Hydrilla [Hydrilla verticillata (L.F.) Royale] was introduced in Florida lakes 50 years ago and is now one of the most serious aquatic weed problems in the United States. This plant possesses numerous mechanisms of vegetative reproduction that enables it to spread very rapidly. Management of this ...

438

Giant Hogweed An attractive but dangerous federal noxious weed.  

E-print Network

(1) Giant Hogweed An attractive but dangerous federal noxious weed. Have you seen this plant in Michigan? Hogweed is hazardous Giant hogweed is a majestic plant that can grow over 15 feet. Although attractive, giant hogweed is a public health hazard because it can cause se- vere skin irritation

439

Developing weed-suppressive soils through improved soil quality management  

Microsoft Academic Search

Manipulating soil microbial communities using soil and crop management practices is a basic strategy in developing sustainable agricultural systems. Sustainable farming is based, in part, on the efficient management of soil microorganisms to improve soil quality. However, the identification of biological indicators of soil quality that can be used to predict weed suppression in soils has received little attention. We

Robert J Kremer; Jianmei Li

2003-01-01

440

Fatty acid composition of oils extracted from Canadian weed seeds  

Microsoft Academic Search

The fatty acid composition of the diethyl ether extract from nine varieties of Canadian weed seeds is reported. Fatty acid\\u000a compositions forRumex pseudonatronatus L. Borbus,Setaria viridis L. Beauv., andChenopodium album L. have not been previously reported.

J. K. Daun; R. Tkachuk

1976-01-01

441

Chemical weed management in wheat at higher altitudes.  

PubMed

To evaluate the effect of different herbicides for controlling weeds in wheat (variety Fakhr-i-Sarhad),at higher attitude, an experiment was conducted at Agriculture Research Station, Chitral during Rabi season 2003-04, using Randomized Complete Block Design, keeping four replications. The experiment, sown in November comprised of eight treatments, viz; seven herbicides and a weedy check. Each treatment consisted of 5 rows each 30 cm apart and 5 m long thus giving a total size of 5 m x 1.5 m. The herbicides used included; terbutryn + triasulfuron at 0.16 kg, 2,4-D at 0.7 kg, fenoxaprop-P-ethyl at 0.93 kg, clodinafop at 0.05 kg, bromoxynil + MCPA at 0.49 kg, carfentrazon-ethyl at 0.02 kg and isoproturon at 1.0 kg a.i ha(-1). The data were recorded on weed kill efficiency (%), fresh weed biomass (kg ha(-1)), plant height (cm), spike length (cm), number of tillers m(-2), number of grains spike(-1), thousand grains weight (g), biological yield (kg ha(-1)), grain yield (kg ha(-1)) and harvest index (%). The data recorded on weed kill efficiency, weed biomass (kg ha1), grains yield (kg ha(-1)) and harvest index (%) were significantly affected by the different herbicidal treatments. Statistically isoproturon treatment exhibited the best performance, with maximum weed kill efficiency (48.26%) and minimum fresh weed biomass (433.3 kg ha(-1)) as compared to weedy check (6 %) and (1102 kg ha(-1)), respectively. Similarly, the spike length (8.34 cm), number of tillers (427 m(-2)), number of grains spike(-1) (38.0), thousand grains weight (39.85 g), biological yield (8475 kg ha(-1)), grain yield (2530 kg ha(-1)) and harvest index (31.3%) were the highest in isoproturon treatments as compared to weedy check having (7.64 cm), (356 m(-2)), (34.1), (37.12 g), (6858 kg), (1913 kg ha(-1)) and (27%), respectively. PMID:18399449

Khan, Ikramullah; Marwat, Khan Bahadar; Hussain, Zahid

2007-01-01

442

Biological control of weeds by means of plant pathogens: Significance for integrated weed management in modern agro-ecology  

Microsoft Academic Search

Biological control of weeds by using plant pathogens has gainedacceptance as a practical, safe, environmentally beneficial, weedmanagement method applicable to agro-ecosystems. The interest in thisweed control approach from public and private groups, and support forresearch and developmental effort, are on the upswing. This increasinginterest is stimulated largely due to major economic, social, andenvironmental forces that are directing our choices in

R. Charudattan

2001-01-01

443

Integrated pest management and weed management in the United States and Canada.  

PubMed

There is interest in more diverse weed management tactics because of evolved herbicide resistance in important weeds in many US and Canadian crop systems. While herbicide resistance in weeds is not new, the issue has become critical because of the adoption of simple, convenient and inexpensive crop systems based on genetically engineered glyphosate-tolerant crop cultivars. Importantly, genetic engineering has not been a factor in rice and wheat, two globally important food crops. There are many tactics that help to mitigate herbicide resistance in weeds and should be widely adopted. Evolved herbicide resistance in key weeds has influenced a limited number of growers to include a more diverse suite of tactics to supplement existing herbicidal tactics. Most growers still emphasize herbicides, often to the exclusion of alternative tactics. Application of integrated pest management for weeds is better characterized as integrated weed management, and more typically integrated herbicide management. However, adoption of diverse weed management tactics is limited. Modifying herbicide use will not solve herbicide resistance in weeds, and the relief provided by different herbicide use practices is generally short-lived at best. More diversity of tactics for weed management must be incorporated in crop systems. © 2014 Society of Chemical Industry. PMID:25346235

Owen, Micheal Dk; Beckie, Hugh J; Leeson, Julia Y; Norsworthy, Jason K; Steckel, Larry E

2015-03-01

444

Impact of Fertilizing Pattern on the Biodiversity of a Weed Community and Wheat Growth  

PubMed Central

Weeding and fertilization are important farming practices. Integrated weed management should protect or improve the biodiversity of farmland weed communities for a better ecological environment with not only increased crop yield, but also reduced use of herbicides. This study hypothesized that appropriate fertilization would benefit both crop growth and the biodiversity of farmland weed communities. To study the effects of different fertilizing patterns on the biodiversity of a farmland weed community and their adaptive mechanisms, indices of species diversity and responses of weed species and wheat were investigated in a 17-year field trial with a winter wheat-soybean rotation. This long term field trial includes six fertilizing treatments with different N, P and K application rates. The results indicated that wheat and the four prevalent weed species (Galium aparine, Vicia sativa, Veronica persica and Geranium carolinianum) showed different responses to fertilizer treatment in terms of density, plant height, shoot biomass, and nutrient accumulations. Each individual weed population exhibited its own adaptive mechanisms, such as increased internode length for growth advantages and increased light interception. The PK treatment had higher density, shoot biomass, Shannon-Wiener and Pielou Indices of weed community than N plus P fertilizer treatments. The N1/2PK treatment showed the same weed species number as the PK treatment. It also showed higher Shannon-Wiener and Pielou Indices of the weed community, although it had a lower wheat yield than the NPK treatment. The negative effects of the N1/2PK treatment on wheat yield could be balanced by the simultaneous positive effects on weed communities, which are intermediate in terms of the effects on wheat and weeds. PMID:24416223

Tang, Leilei; Cheng, Chuanpeng; Wan, Kaiyuan; Li, Ruhai; Wang, Daozhong; Tao, Yong; Pan, Junfeng; Xie, Juan; Chen, Fang

2014-01-01

445

7 CFR 360.303 - Approval of an application for a permit to move a noxious weed; conditions specified in permit.  

Code of Federal Regulations, 2011 CFR

...application for a permit to move a noxious weed; conditions specified in permit. 360...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.303 Approval of an application for a permit to move a noxious weed; conditions specified in permit....

2011-01-01

446

7 CFR 360.303 - Approval of an application for a permit to move a noxious weed; conditions specified in permit.  

Code of Federal Regulations, 2013 CFR

...application for a permit to move a noxious weed; conditions specified in permit. 360...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.303 Approval of an application for a permit to move a noxious weed; conditions specified in permit....

2013-01-01

447

7 CFR 360.303 - Approval of an application for a permit to move a noxious weed; conditions specified in permit.  

Code of Federal Regulations, 2014 CFR

...application for a permit to move a noxious weed; conditions specified in permit. 360...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.303 Approval of an application for a permit to move a noxious weed; conditions specified in permit....

2014-01-01

448

7 CFR 360.303 - Approval of an application for a permit to move a noxious weed; conditions specified in permit.  

Code of Federal Regulations, 2012 CFR

...application for a permit to move a noxious weed; conditions specified in permit. 360...SERVICE, DEPARTMENT OF AGRICULTURE NOXIOUS WEED REGULATIONS § 360.303 Approval of an application for a permit to move a noxious weed; conditions specified in permit....

2012-01-01

449

Allergens of weed pollen: an overview on recombinant and natural molecules.  

PubMed

Weeds represent a botanically unrelated group of plants that usually lack commercial or aesthetical value. Pollen of allergenic weeds are able to trigger type I reactions in allergic patients and can be found in the plant families of Asteraceae, Amaranthaceae, Plantaginaceae, Urticaceae, and Euphorbiaceae. To date, 34 weed pollen allergens are listed in the IUIS allergen nomenclature database, which were physicochemically and immunologically characterized to varying degrees. Relevant allergens of weeds belong to the pectate lyase family, defensin-like family, Ole e 1-like family, non-specific lipid transfer protein 1 family and the pan-allergens profilin and polcalcins. This review provides an overview on weed pollen allergens primarily focusing on the molecular level. In particular, the characteristics and properties of purified recombinant allergens and hypoallergenic derivatives are described and their potential use in diagnosis and therapy of weed pollen allergy is discussed. PMID:23806644

Gadermaier, Gabriele; Hauser, Michael; Ferreira, Fatima

2014-03-01

450

A Hybrid Differential Invasive Weed Algorithm for Congestion Management  

NASA Astrophysics Data System (ADS)

This work is dedicated to solve the problem of congestion management in restructured power systems. Nowadays we have open access market which pushes the power system operation to their limits for maximum economic benefits but at the same time making the system more susceptible to congestion. In this regard congestion management is absolutely vital. In this paper we try to remove congestion by generation rescheduling where the cost involved in the rescheduling process is minimized. The proposed algorithm is a hybrid of Invasive Weed Optimization (IWO) and Differential Evolution (DE). The resultant hybrid algorithm was applied on standard IEEE 30 bus system and observed to beat existing algorithms like Simple Bacterial foraging (SBF), Genetic Algorithm (GA), Invasive Weed Optimization (IWO), Differential Evolution (DE) and hybrid algorithms like Hybrid Bacterial Foraging and Differential Evolution (HBFDE) and Adaptive Bacterial Foraging with Nelder Mead (ABFNM).

Basak, Aniruddha; Pal, Siddharth; Pandi, V. Ravikumar; Panigrahi, B. K.; Das, Swagatam

451

PROCEEDINGS OF THE 6 TH BIENNIAL WEEDS ACROSS BORDERS  

E-print Network

Copies of this document may be made for personal use as long as it not modified in any way. The document or any parts thereof, are not to be sold. Sponsors comisión nacional para el conocimiento y uso de la biodiversidad comisión nacional de áreas naturales protegidas instituto mexicano de tecnología del agua instituto nacional de ecología y cambio climático universidad nacional autónoma de méxico colegio de postgraduados en ciencias agrícolas center for invasive plant management national fish and wildlife foundation /animal and plant health inspection service usdot federal highway administration usdi bureau of land management federal interagency committee for the management of noxious and exotic weeds us fish and wildlife service usda animal and plant health inspection service agriculture and agri-food canada canadian food inspection agency dow agrosciences invasive plant control, inc. Weeds Across Borders 2012 Coordinating Committee

Patricia Koleff; Isabel González; Yolanda Barrios; Georgia Born Schmidt; Jenny Ericson; Mary Ann Rondinella; Francisco Espinosa García; Gina Ramos; Heike Vibrans

452

Identification of Begomoviruses Infecting Crops and Weeds in Belize  

PubMed Central

Plants including pepper, red kidney bean, squash, string bean and tomato, as well as weeds with viral symptoms were collected from five districts in Belize over a three year period with the aim of determining the diversity of the begomoviruses present. Sixty five percent of the samples screened via DNA hybridization produced signals indicative of begomovirus infection. Subsequent PCR amplifications and nucleotide sequence analyses revealed the presence of four begomoviruses in Belize. Pepper golden mosaic virus and Tomato mottle virus-[Flo] were found associated with tomato and sweet pepper and the former was also isolated from hot pepper. Merremia mosaic virus was found infecting hot pepper, sweet pepper and the weed species Euphorbia heterophylla. Euphorbia mosaic virus-[Yucatan Peninsula] was found in hot pepper and Euphorbia. This is the first report of the identification of begomoviruses in Belize. PMID:20596296

McLaughlin, Pamela D.; McLaughlin, Wayne A.; Maxwell, Douglas P.; Roye, Marcia E.

2010-01-01

453

Intra-row weeding with brushes on vertical axes – factors influencing in-row soil height  

Microsoft Academic Search

Interest in mechanical intra-row weed control methods has increased rapidly during recent years due to the public debate about environmental degradation and the growing request of organically grown food. However, since knowledge concerning the working principles, soil influence and weed efficacy is still limited for several of these non-chemical methods, optimum weed control has been difficult to achieve. Intra-row brush

F Fogelberg; G Kritz

1999-01-01

454

Weed Community Composition in Tree Fruit Nurseries Treated with Methyl Bromide and Alternative Fumigants  

Microsoft Academic Search

Many agricultural cropping systems have relied on methyl bromide (MeBr) for pest control, including weeds, for decades. Alternative fumigants are being sought worldwide because MeBr has been identified as an ozone-layer depleting substance. Weed communities respond dynamically to alterations in management systems. Thus, transition from MeBr to alternative fumigants may cause shifts in weed communities. This hypothesis was tested in

Anil Shrestha; Greg T. Browne; Bruce D. Lampinen; Sally M. Schneider; Thomas J. Trout

2009-01-01

455

Weed hosts of Verticillium dahliae in crete: Susceptibility, symptomatology and significance  

Microsoft Academic Search

A survey of common and uncommon weed species usually showing Verticillium wilt symptoms was carried out during 1992–2000 in\\u000a Crete, Greece.Verticillium dahliae was isolated in 48 out of 182 sampled fields, in which several weed species were grown, from several locations in Oropedio,\\u000a Lasithi. Altogether, 124 isolates ofV. dahliae were recovered from the vascular stem-tissue of 19 weed species, belonging

E. K. Ligoxigakis; D. J. Vakalounakis; C. C. Thanassoulopoulos

2002-01-01

456

Effects of alternative winter cover cropping systems on weed suppression in organically grown tomato ( Solanum lycopersicum )  

Microsoft Academic Search

Weed control is a major concern for organic farmers around the world and non-chemical weed control methods are now the subject\\u000a of many investigations. Field studies were conducted in tomato (Solanum lycopersicum L.) from 2004 to 2006 at the Black Sea Agricultural Research Institute experiment field to determine the weed suppressive\\u000a effects of winter cover crops. Treatments consisted of ryegrass

Husrev Mennan; Mathieu Ngouajio; Dogan Is?k; Emine Kaya

2009-01-01

457

Searching for the origins of arable weeds in the Near East  

Microsoft Academic Search

This short note adds to earlier attempts at identifying arable weeds on late Pleistocene\\/early Holocene sites in the Near\\u000a East. Nineteen potential arable weed taxa that have no known use were selected. The occurrence of these taxa at sites with\\u000a morphologically wild cereals was compared to sites with morphologically domestic cereals. The presumed arable weed taxa were\\u000a as common on

George Willcox

458

WEED COMMUNITIES OF SUNFLOWER CROP IN SUKKUR AND KHAIRPUR, SINDH: AUTUMN ASPECT  

Microsoft Academic Search

The survey of weed communities of sunflower crop was conducted in five sunflower growing areas of Sukkur and Khairpur districts during 2003. A total of 33 weed species belonging to 30 genera and 15 angiosperm families were recorded. Five weed communities viz.: 1) Cyperus-Eclipta-Brachiaria in Ghulam Qasim Jiskani (district Khairpur), 2) Dactyloctenium-Cyperus- Brachiaria in Kotedji (district Khairpur), 3) Trianthema- Cyperus-Brachiaria

Rahmatullah Qureshi; Rabia Asma Memon

459

The weeds from the thatch roofs of medieval cottages from the south of England  

Microsoft Academic Search

Late medieval soot-coated thatch includes a number of very well preserved weeds as well as cereals or reeds. This paper investigates\\u000a the weeds from the thatch roofs of 13 cottages from the south of England. It describes the exceptional preservation of the\\u000a weeds which include plant parts rarely recorded in archaeological contexts and the information they can give about late

Dominique de Moulins

2007-01-01

460

Weed hosts of Paratrichodorus allius and tobacco rattle virus in the Pacific Northwest  

Microsoft Academic Search

The ability of several weed species to serve as hosts for tobacco rattle virus (TKV), the causal agent of corky ringspot disease\\u000a of potato (CRS), and its nematode vector,Paratrichodorus allius, was investigated in greenhouse studies. ViruliferousP. allius multiplied on 24 out of 37 weed species tested, indicating they were suitable hosts of the vector. However, only 11 of these\\u000a weeds

H. Mojtahedi; R. A. Boydston; P. E. Thomas; J. M. Crosslin; G. S. Santo; E. Riga; T. L. Anderson

2003-01-01

461

Potential for phytoextraction of PCBs from contaminated soils using weeds  

Microsoft Academic Search

A comprehensive investigation of the potential of twenty-seven different species of weeds to phytoextract polychlorinated biphenyls (PCBs) from contaminated soil was conducted at two field sites (Etobicoke and Lindsay) in southern Ontario, Canada. Soil concentrations were 31?g\\/g and 4.7?g\\/g at each site respectively. All species accumulated PCBs in their root and shoot tissues. Mean shoot concentrations at the two sites

Sarah A. Ficko; Allison Rutter; Barbara A. Zeeb

2010-01-01

462

Agronomic and environmental factors influence weed composition and canola competitiveness  

E-print Network

in southern Manitoba W. J. Bullied1, R. C. Van Acker1, A. M. Marginet1, and N. C. Kenkel2 1Department of Plant February 2005, accepted 21 November 2005. Bullied, W. J., Van Acker, R. C., Marginet, A. M. and Kenkel, N, environment, weeds Bullied, W. J., Van Acker, R. C., Marginet, A. M. et Kenkel, N. C. 2006. Les paramètres

Kenkel, Norm

463

Are some weeds sleeping? Some concepts and reasons  

Microsoft Academic Search

Summary  Sleeper weeds, a relatively new concept, are defined as a sub-group of invasive plant species for which their population sizes\\u000a are known to have increased significantly more than 50 years after they became naturalized. The invasions of the European\\u000a herb Hieracium pilosella into New Zealand, the northeast Asian Fallopia japonica and the Sicilian Senecio squalidus into Britain are presented as

R. H. Groves

2006-01-01

464

Protecting the Environment Using Integrated Weed Management in Lawns  

E-print Network

, respectively. Example 1. Calculate use of dry formulations (granules) of herbicides or dry weed and feed mixtures: The product label recommends applying 3 pounds on each 1,000 square feet of lawn. ? Divide the actual area to be treated by 1... reach a critical population. Use the least amount of herbicide over the smallest area that will effectively control the problem. Many herbicides available at lawn and garden stores are in ready-to-spray formulations. Read the labels carefully...

Ketchersid, Mary; Baumann, Paul A.

2008-03-27

465

Water Hyacinths and Alligator Weeds for Final Filtration of Sewage  

NASA Technical Reports Server (NTRS)

The potential of water hyacinths (Eichhornia crassipes) (Mart.) Solms and alligator weeds (Alternanthera philoxerides) (Mart.) Griesb. as secondary and tertiary filtration systems for domestic sewage was demonstrated. These two vascular aquatic plants reduced the suspended solids, total Kjeldahl nitrogen, total phosphorus, BOD sub 5, and total organic carbon levels in domestic sewage from 60 percent to 98 percent within a two week period. These plants grown in domestic sewage were also free of toxic levels of trace heavy metals.

Wolverton, B. C.; Mcdonald, R. C.; Gordon, J.

1976-01-01

466

Weed flora of cereal crops in Canterbury, New Zealand  

Microsoft Academic Search

Weed communities in Canterbury, New Zealand, cereal crops were characterised in the 1990–91, 1991–92, and 1992–93 growing seasons by measuring species population densities and harvest?time biomass in 39 and 45 fields respectively of wheat (Triticum aestivum) and barley (Hordeum vulgare) in the absence of herbicide treatments. A total of >57 species in >49 genera were recorded representing a total of

G. W. Bourdöt; G. A. Hurrell; D. J. Saville

1998-01-01

467

Data Weeding Techniques Applied to Roget’s Thesaurus  

Microsoft Academic Search

\\u000a It can be difficult to automatically generate “nice” graphical representations for concept lattices from lexical databases,\\u000a such as Roget’s Thesaurus, because the data sources tend to be large and complex. This paper discusses a variety of “data\\u000a weeding” techniques that can be applied in order to reduce the size of a concept lattice, first in general, and then with\\u000a respect

Uta Priss; L. John Old

468

Differential tolerances of weed species to aluminum, manganese and salinity  

Microsoft Academic Search

Seven weed species were screened for tolerance to acid soil factors (Al and Mn toxicities) and to saline soil factors (NaCl and Na2SO4) in greenhouse peat cultures. Species used were: Echinochloa crusgalli (L.) Beauv. var. crusgalli?barnyard grass; Kochia scoparia (L.) Schrad.?Kochia?summer cypress; Setaria viridis (L.) Beauv.?green foxtail; Amaranthus retroflexus (L.) ? redroot pigweed; Chenopodium album (L.) ?lambsquarters; Convolvulus arvensis (L.)

J. J. Bilski; C. D. Foy

1988-01-01

469

Stratification requirements for seed dormancy alleviation in a wetland weed.  

PubMed

Echinochloaoryzicola(syn.E. phyllopogon) is an exotic weed of California rice paddies that has evolved resistance to multiple herbicides. Elimination of seedlingsthroughcertain weed control methods can limit the spread of this weed, but is contingent on accurate predictions of germination and emergence timing, which are influenced by seed dormancy levels.In summer annuals, dormancy can often be relieved through stratification, a period of prolonged exposure to cold and moist conditions.We used population-based threshold models to quantify the effects of stratification on seed germination of four E. Oryzicola populations at a range of water potential (?) and oxygen levels. We also determined how stratification temperatures, moisture levels and durations contributed to dormancy release. Stratification released dormancy by decreasing base ? and hydrotimerequired for germination and by eliminating any germination sensitivity to oxygen. Stratification also increased average germination rates (GR), which were used as a proxy for relative dormancy levels. Alternating temperatures nearly doubled GR in all populations, indicating that seeds could be partially dormant despite achieving high final germination percentages. Stratification at ??=?0 MPa increased GR compared to stratification at lower water potentials, demonstrating that ? contributed to regulating dormancy release. Maximum GR occurred after 2-4 weeks of stratification at 0 MPa; GR were often more rapid for herbicide-resistant than for herbicide-susceptible seeds, implying greater dormancy in the latter. Manipulation of field conditions to promote dormancy alleviation of E. oryzicola seeds might improve the rate and uniformity of germination for seed bank depletion through seedling weed control. Our results suggest field soil saturation in winter would contribute towards E. oryzicola dormancy release and decrease the time to seedling emergence. PMID:24039714

Boddy, Louis G; Bradford, Kent J; Fischer, Albert J

2013-01-01

470

Stratification Requirements for Seed Dormancy Alleviation in a Wetland Weed  

PubMed Central

Echinochloaoryzicola(syn.E. phyllopogon) is an exotic weed of California rice paddies that has evolved resistance to multiple herbicides. Elimination of seedlingsthroughcertain weed control methods can limit the spread of this weed, but is contingent on accurate predictions of germination and emergence timing, which are influenced by seed dormancy levels.In summer annuals, dormancy can often be relieved through stratification, a period of prolonged exposure to cold and moist conditions.We used population-based threshold models to quantify the effects of stratification on seed germination of four E. Oryzicola populations at a range of water potential (?) and oxygen levels. We also determined how stratification temperatures, moisture levels and durations contributed to dormancy release. Stratification released dormancy by decreasing base ? and hydrotimerequired for germination and by eliminating any germination sensitivity to oxygen. Stratification also increased average germination rates (GR), which were used as a proxy for relative dormancy levels. Alternating temperatures nearly doubled GR in all populations, indicating that seeds could be partially dormant despite achieving high final germination percentages. Stratification at ??=?0 MPa increased GR compared to stratification at lower water potentials, demonstrating that ? contributed to regulating dormancy release. Maximum GR occurred after 2-4 weeks of stratification at 0 MPa; GR were often more rapid for herbicide-resistant than for herbicide-susceptible seeds, implying greater dormancy in the latter. Manipulation of field conditions to promote dormancy alleviation of E. oryzicola seeds might improve the rate and uniformity of germination for seed bank depletion through seedling weed control. Our results suggest field soil saturation in winter would contribute towards E. oryzicola dormancy release and decrease the time to seedling emergence. PMID:24039714

Boddy, Louis G.; Bradford, Kent J.; Fischer, Albert J.

2013-01-01

471

Killing Weeds with 2,4-D. Extension Bulletin 389.  

ERIC Educational Resources Information Center

Discussed is the use of the herbicide 2,4-D. Though written for farmers and agricultural workers, the pamphlet considers turf weed control and use of 2,4-D near ornamental plants. Aspects of the use of this herbicide covered are: (1) the common forms of 2,4-D; (2) plant responses and tolerances to the herbicide; (3) dilution and concentration of…

Lee, Oliver C.

472

Development of remote sensing based site specific weed management for Midwest mint production  

NASA Astrophysics Data System (ADS)

Peppermint and spearmint are high value essential oil crops in Indiana, Michigan, and Wisconsin. Although the mints are profitable alternatives to corn and soybeans, mint production efficiency must improve in order to allow industry survival against foreign produced oils and synthetic flavorings. Weed control is the major input cost in mint production and tools to increase efficiency are necessary. Remote sensing-based site-specific weed management offers potential for decreasing weed control costs through simplified weed detection and control from accurate site specific weed and herbicide application maps. This research showed the practicability of remote sensing for weed detection in the mints. Research was designed to compare spectral response curves of field grown mint and weeds, and to use these data to develop spectral vegetation indices for automated weed detection. Viability of remote sensing in mint production was established using unsupervised classification, supervised classification, handheld spectroradiometer readings and spectral vegetation indices (SVIs). Unsupervised classification of multispectral images of peppermint production fields generated crop health maps with 92 and 67% accuracy in meadow and row peppermint, respectively. Supervised classification of multispectral images identified weed infestations with 97% and 85% accuracy for meadow and row peppermint, respectively. Supervised classification showed that peppermint was spectrally distinct from weeds, but the accuracy of these measures was dependent on extensive ground referencing which is impractical and too costly for on-farm use. Handheld spectroradiometer measurements of peppermint, spearmint, and several weeds and crop and weed mixtures were taken over three years from greenhouse grown plants, replicated field plots, and production peppermint and spearmint fields. Results showed that mints have greater near infrared (NIR) and lower green reflectance and a steeper red edge slope than all weed species. These distinguishing characteristics were combined to develop narrow band and broadband spectral vegetation indices (SVIs, ratios of NIR/green reflectance), that were effective in differentiating mint from key weed species. Hyperspectral images of production peppermint and spearmint fields were then classified using SVI-based classification. Narrowband and broadband SVIs classified early season peppermint and spearmint with 64 to 100% accuracy compared to 79 to 100% accuracy for supervised classification of multispectral images of the same fields. Broadband SVIs have potential for use as an automated spectral indicator for weeds in the mints since they require minimal ground referencing and can be calculated from multispectral imagery which is cheaper and more readily available than hyperspectral imagery. This research will allow growers to implement remote sensing based site specific weed management in mint resulting in reduced grower input costs and reduced herbicide entry into the environment and will have applications in other specialty and meadow crops.

Gumz, Mary Saumur Paulson

473

How weeds emerge: a taxonomic and trait-based examination using United States data  

PubMed Central

Weeds can cause great economic and ecological harm to ecosystems. Despite their importance, comparisons of the taxonomy and traits of successful weeds often focus on a few specific comparisons – for example, introduced versus native weeds.We used publicly available inventories of US plant species to make comprehensive comparisons of the factors that underlie weediness. We quantitatively examined taxonomy to determine if certain genera are overrepresented by introduced, weedy or herbicide-resistant species, and we compared phenotypic traits of weeds to those of nonweeds, whether introduced or native.We uncovered genera that have more weeds and introduced species than expected by chance and plant families that have more herbicide-resistant species than expected by chance. Certain traits, generally related to fast reproduction, were more likely to be associated with weedy plants regardless of species’ origins. We also found stress tolerance traits associated with either native or introduced weeds compared with native or introduced nonweeds. Weeds and introduced species have significantly smaller genomes than nonweeds and native species.These results support trends for weedy plants reported from other floras, suggest that native and introduced weeds have different stress adaptations, and provide a comprehensive survey of trends across weeds within the USA. PMID:24494694

Kuester, Adam; Conner, Jeffrey K; Culley, Theresa; Baucom, Regina S

2014-01-01

474

Integration of agronomic practices with herbicides for sustainable weed management in aerobic rice.  

PubMed

Till now, herbicide seems to be a cost effective tool from an agronomic view point to control weeds. But long term efficacy and sustainability issues are the driving forces behind the reconsideration of herbicide dependent weed management strategy in rice. This demands reappearance of physical and cultural management options combined with judicious herbicide application in a more comprehensive and integrated way. Keeping those in mind, some agronomic tools along with different manual weeding and herbicides combinations were evaluated for their weed control efficacy in rice under aerobic soil conditions. Combination of competitive variety, higher seeding rate, and seed priming resulted in more competitive cropping system in favor of rice, which was reflected in lower weed pressure, higher weed control efficiency, and better yield. Most of the herbicides exhibited excellent weed control efficiency. Treatments comprising only herbicides required less cost involvement but produced higher net benefit. On the contrary, treatments comprising both herbicide and manual weeding required high cost involvement and thus produced lower net benefit. Therefore, adoption of competitive rice variety, higher seed rate, and seed priming along with spraying different early-postemergence herbicides in rotation at 10 days after seeding (DAS) followed by a manual weeding at 30 DAS may be recommended from sustainability view point. PMID:24223513

Anwar, M P; Juraimi, A S; Mohamed, M T M; Uddin, M K; Samedani, B; Puteh, A; Man, Azmi

2013-01-01

475

Integration of Agronomic Practices with Herbicides for Sustainable Weed Management in Aerobic Rice  

PubMed Central

Till now, herbicide seems to be a cost effective tool from an agronomic view point to control weeds. But long term efficacy and sustainability issues are the driving forces behind the reconsideration of herbicide dependent weed management strategy in rice. This demands reappearance of physical and cultural management options combined with judicious herbicide application in a more comprehensive and integrated way. Keeping those in mind, some agronomic tools along with different manual weeding and herbicides combinations were evaluated for their weed control efficacy in rice under aerobic soil conditions. Combination of competitive variety, higher seeding rate, and seed priming resulted in more competitive cropping system in favor of rice, which was reflected in lower weed pressure, higher weed control efficiency, and better yield. Most of the herbicides exhibited excellent weed control efficiency. Treatments comprising only herbicides required less cost involvement but produced higher net benefit. On the contrary, treatments comprising both herbicide and manual weeding required high cost involvement and thus produced lower net benefit. Therefore, adoption of competitive rice variety, higher seed rate, and seed priming along with spraying different early-postemergence herbicides in rotation at 10 days after seeding (DAS) followed by a manual weeding at 30 DAS may be recommended from sustainability view point. PMID:24223513

Anwar, M. P.; Juraimi, A. S.; Mohamed, M. T. M.; Uddin, M. K.; Samedani, B.; Puteh, A.; Man, Azmi

2013-01-01

476

Federal Noxious Weed List (as of June 30, 2006) Aquatic/Wetland  

E-print Network

. Johnston Cuscuta obtusiflora Humboldt, Bonpland, & Kunth Cuscuta occidentalis Millspaugh ex Mill & Nuttall Ageratina adenophora (Sprengel) King & Robinson (crofton weed) Alternanthera sessilis (Linnaeus) R. Brown ex

Nowak, Robert S.

477

Airborne gamma-ray spectrometer and magnetometer survey: Weed quadrangle, California. Final report  

SciTech Connect

Volume II contains the flight path, radiometric multi-parameter stacked profiles, magnetic and ancillary parameter stacked profiles, histograms, and anomaly maps for the Weed Quadrangle in California.

Not Available

1981-05-01

478

National Evaluation of Weed & Seed: Cross-Site Analysis  

NSDL National Science Digital Library

Published this month by the Department of Justice, this report assesses the results of the "weed and seed" approach to crime prevention, monitored for the last eight years at eight selected area sites in the U.S.. "Weeding" is defined as "concentrated and enhanced law enforcement efforts to identify, arrest, and prosecute" criminals, especially violent offenders and drug traffickers. The cited objective is the removal of criminals from the targeted area. "Seeding" involves community efforts to deter further crime by offering a variety of human services, including afterschool, weekend, and summer youth activities; adult literacy classes; parental counseling; and neighborhood revitalization. The report offers cross-site analysis and finds that the most effective results were achieved in sites of smaller geographical area with more community resources to bring to bear. The report concludes that "in selecting sites for new program funding, Weed and Seed should place its funding priority on sites with geographically small target areas and with favorable community settings and program designs."

Cordner, Gary.

479

Experimental and natural weed host-virus relations.  

PubMed

Weeds, as alternative hosts of plant viruses and nutrient plants of virus vectors play important role in virus ecology and epidemiology. The aim of our study was to discover new weed-virus relations. Therefore some weed species were mechanically inoculated with 28 viruses (strains or isolates) maintained in our glasshouse. Different weed species with and without visible symptoms were collected from agro-, water ecosystems and wastelands of Hungary between 1997 and 2003. Virus infections were evaluated by biotests, DAS ELISA serological methods, electronmicroscopy and immunosorbent electronmicroscopy (ISEM). Under glasshouse conditions Ambrosia artemisifolia was considered as a virophob species, showing resistance to all viruses listed above. A series of new artificial (Chenopodium album--SoMV (LH+SH)*, AMV (LH+SH); C. berlandieri--PVY(NTN) (LH), AMV (LH+SH), CMV (LH), SoMV (LH+SH), ObPV (LH+SH), ZYMV-10 (LH): C. ugandae--ObPV (LH), SoMV (L); C. glaucum--ObPV (LH), SoMV (L); Echinocystis lobata--PVX (L), ZYMV (LH+SH); Solanum nigrum--MYFV (LH+SH), PVY(N) (L), PVY(NTN) (LH+SH), SoMV (LH), TMV (SH), CMV (SH); S. dulcamara--CMV-U/246 (SH), PVY(NTN) (LH), SoMV-H (L), TMV-O (L); S. luteum--PVY(N) (SH), PVY(NTN) (LH+L), TMV(SH).) and natural (Asclepias syriaca--TMV, AMV, TSWV; Alisma plantago-aquatica--PVY, SoMV; Ambrosia artemisiifolia--CMV; Chenopodium album--CMV, PVS, PLRV; C. hybridum--CMV; Cirsium canum--CMV, PVM; Carex vulpina--CMV; Comium maculatum--PVY; Datura stramonium--PVA, PVX, PVS, PVM, CMV, TMV; Lysimachia vulgaris--ArMV, BNYVV, CMV, TMV; Lythrum salicaria--ArMV; Malva neglecta--CMV; Mercurialis annua--SoMV; Solanum nigrum--CMV, PVY, PVY(N); Solidago gigantea--CMV, RpRSV, BNYVV; Stenactis annua--PVM, PVA) weed--virus relations were detected. The epidemiological role of perennial hosts (A. syriaca, A. planlago aquatica, C. canurm, L. vulgaris, L. salicaria, S. gigantea) is especially high, because they can serve as infection sources as well as overwintering hosts of different plant viruses. PMID:15759395

Kazinczi, G; Horváth, J; Takács, A P; Gáborjányi, R; Béres, I

2004-01-01

480

Early growth of Quercus castaneifolia (C.A. Meyer) seedlings as affected by weeding, shading and irrigation.  

PubMed

The influence of shading, irrigation and weeding on survival, growth and morphology of 1-year Quercus castaneifolia seedlings was studied in north of Iran. The seedlings were grown under eight treatments including full-light versus artificial shading, irrigation versus non-irrigation and weed presence versus weed removing at three replicates. At the end of the first growing season seedling survival in all treatments was 100%. Weed removing had positive effect on height, diameter growth, slenderness coefficient and leaf area of Q. castaneifolia. Irrigation enhanced diameter growth and leaf area and shading increased leaf area. Irrigation had no significant effect on plant growth where the weed was removed. In weed plots seedlings growth and leaf area were greater in shading than in full-light. The results indicated that for 1 year Q. castaneifolia seedlings, weeding, in contrast to irrigation, is an essential factor. Where the weed competition is a difficulty, plantation with higher stem length should be applied. PMID:19070109

Mirzaei, Javad; Tabari, Masoud; Daroodi, Hadi

2007-08-01

481

36 CFR 222.8 - Cooperation in control of estray or unbranded livestock, animal diseases, noxious farm weeds, and...  

Code of Federal Regulations, 2010 CFR

...estray or unbranded livestock, animal diseases, noxious farm weeds...estray or unbranded livestock, animal diseases, noxious farm weeds...noxious farm weeds. (2) The Animal and Plant Health Inspection...it does not conflict with the Wild Free-Roaming Horse and...

2010-07-01

482

36 CFR 222.8 - Cooperation in control of estray or unbranded livestock, animal diseases, noxious farm weeds, and...  

Code of Federal Regulations, 2014 CFR

...estray or unbranded livestock, animal diseases, noxious farm weeds...estray or unbranded livestock, animal diseases, noxious farm weeds...noxious farm weeds. (2) The Animal and Plant Health Inspection...it does not conflict with the Wild Free-Roaming Horse and...

2014-07-01

483

36 CFR 222.8 - Cooperation in control of estray or unbranded livestock, animal diseases, noxious farm weeds, and...  

Code of Federal Regulations, 2013 CFR

...estray or unbranded livestock, animal diseases, noxious farm weeds...estray or unbranded livestock, animal diseases, noxious farm weeds...noxious farm weeds. (2) The Animal and Plant Health Inspection...it does not conflict with the Wild Free-Roaming Horse and...

2013-07-01

484

36 CFR 222.8 - Cooperation in control of estray or unbranded livestock, animal diseases, noxious farm weeds, and...  

Code of Federal Regulations, 2011 CFR

...estray or unbranded livestock, animal diseases, noxious farm weeds...estray or unbranded livestock, animal diseases, noxious farm weeds...noxious farm weeds. (2) The Animal and Plant Health Inspection...it does not conflict with the Wild Free-Roaming Horse and...

2011-07-01

485

36 CFR 222.8 - Cooperation in control of estray or unbranded livestock, animal diseases, noxious farm weeds, and...  

Code of Federal Regulations, 2012 CFR

...estray or unbranded livestock, animal diseases, noxious farm weeds...estray or unbranded livestock, animal diseases, noxious farm weeds...noxious farm weeds. (2) The Animal and Plant Health Inspection...it does not conflict with the Wild Free-Roaming Horse and...

2012-07-01

486

A survey of management and economic impact of weeds in dryland cotton cropping systems of subtropical Australia  

Microsoft Academic Search

In dryland cotton cropping systems, the main weeds and effectiveness of management practices were identified, and the economic impact of weeds was estimated using information collected in a postal and a field survey of Southern Queensland and northern New South Wales. Forty-eight completed questionnaires were returned, and 32 paddocks were monitored in early and late summer for weed species and

S. R. Walker; I. N. Taylor; G. Milne; V. A. Osten; Z. Hoque; R. J. Farquharson

2005-01-01

487

Modeling with Limited Data: The Influence of Crop Rotation and Management on Weed Communities and Crop Yield Loss  

Technology Transfer Automated Retrieval System (TEKTRAN)

Theory and models of crop yield loss from weed competition have lead to decision models to help growers with cost-effective tactical weed management. Weed management decision models are available for multiple-species populations in a single season of several crops. Growers also rely on crop rotation...

488

Effects of polyethylene mulch in a short-rotation, poplar plantation vary with weed-control strategies,  

E-print Network

Effects of polyethylene mulch in a short-rotation, poplar plantation vary with weed polyethylene mulch (poly mulch) across a range of site conditions, weed-control treatments and genotypes rights reserved. Keywords: Polyethylene mulch; Woody crops; Weed control Forest Ecology and Management

Green, Scott

489

Influence of weed mat and surface sawdust mulch on soil nutrient availability and soil chemical properties under organic blueberry production  

Technology Transfer Automated Retrieval System (TEKTRAN)

Weed control represents one of the most important cultural management aspects for organic blueberry production. Two of the most common ways to control weeds in blueberries is by the use of surface sawdust mulch or by landscape fabric, often referred to as weed mat. Soil temperature and soil moisture...

490

Cover crop residue and organic mulches provide weed control during limited-input no-till collard production  

Technology Transfer Automated Retrieval System (TEKTRAN)

Limited input producers may adopt no-till if sufficient weed suppression can be achieved. High-biomass producing cover crops used in conjunction with organic mulches may provide sufficient weed control in no-till vegetable production. Our objective was to quantify weed suppression from a summer co...

491

Application for CALS-CCE 2012 Summer Internship Title of project: Organic weed management for school grounds  

E-print Network

Application for CALS-CCE 2012 Summer Internship Title of project: Organic weed management the efficacy of organic herbicides versus thermal removal in controlling weeds prevalent on NYS school landscapes. Thermal weeding refers to equipment that delivers intense bursts of heat on plants. Thermal

Keinan, Alon

492

Weed Competition Control in Hardwood Plantations John R. Seifert, Division of Forestry, Indiana Department of Natural Resources  

E-print Network

Weed Competition Control in Hardwood Plantations FNR-224 John R. Seifert, Division of Forestry and Natural Resources, Purdue University Introduction Controlling or eliminating weed competition-growing herbaceous weeds such as grasses, sedges, and broad-leaved plants or undesired woody perennials such as trees

493

Maize Dwarf Mosaic Can Reduce Weed Suppressive Ability of Sweet Corn Martin M. Williams II and Jerald K. Pataky*  

E-print Network

Maize Dwarf Mosaic Can Reduce Weed Suppressive Ability of Sweet Corn Martin M. Williams II prevalent viral disease of sweet corn grown in many regions of North America and Europe. Although some weeds escape control in most sweet corn fields, the extent to which MDM influences the weed suppressive ability

Sims, Gerald K.

494

Weed Management in Pastures and Rangeland -20091 B.A. Sellers and J.A. Ferrell2  

E-print Network

SS-AGR-08 Weed Management in Pastures and Rangeland - 20091 B.A. Sellers and J.A. Ferrell2 1 of County Commissioners Cooperating. Interim Dean Millie Ferrer. Effective weed control begins with good pasture or rangeland management. Weeds are seldom a serious problem in a well managed, vigorously growing

Jawitz, James W.

495

Mario Barco , Attawan Aramrak, Jared Bell and Ian C. Burke Weed Biology-Biotechnology, Washington State University, Pullman, WA  

E-print Network

Mario Barco , Attawan Aramrak, Jared Bell and Ian C. Burke Weed Biology-Biotechnology, Washington State University, Pullman, WA Introduction Weed control is a top priority to growers, conservationists agricultural output and potential land productivity. Herbicides are used extensively to control weed

Collins, Gary S.

496

Those Nasty Weeds Why Not Control Naturally with Livestock? Contributed by Steve Van Vleet, WSU Whitman County Extension Educator  

E-print Network

Those Nasty Weeds ­ Why Not Control Naturally with Livestock? Contributed by Steve Van Vleet, WSU the restricted use of management tools and the prevalence of undesirable plants or weeds that reduce wildlife impacts of herbicides, is causing landowners to seek alternative weed management strategies. One

Collins, Gary S.

497

Influence of Glyphosate and Glufosinate on Weed Control and Sugarbeet (Beta vulgaris) Yield in Herbicide-Tolerant Sugarbeet 1  

Microsoft Academic Search

Field trials were conducted in 1999 and 2000 to determine the influence of weed size and the number of glyphosate or glufosinate applications on weed control and sugarbeet yield. Glyphosate at 840 g\\/ha or glufosinate at 390 g\\/ha was applied one, two, or three times, beginning when the average weed height was 3, 10, 15, or 25 cm. Two sequential

ROBERT G. WILSON; C. DEAN YONTS; JOHN A. SMITH

2002-01-01

498

The efficacy of pre-emergence herbicides on problem weeds in woodland regeneration  

Microsoft Academic Search

Weeds germinating from seed are serious competitors for resources with young trees and can delay or prevent woodland establishment and regeneration. However, there is only limited information available on which pre-emergence herbicides are effective on problem weeds that commonly occur in these situations, in particular for perennial species germinating on fertile ex agricultural sites. Following previously reported glasshouse screening experiments

F. L. Dixon; D. V. Clay; I. Willoughby

2006-01-01

499

Effect of herbicides applied pre- and post-emergence on forestry weeds grown from seed  

Microsoft Academic Search

Weeds growing from seed can cause severe problems in forest nurseries and in woodland establishment by competing for resources with the young trees, leading to reduced growth and survival. Herbicides approved for use on new plantings of farm forestry and forest nurseries were usually developed originally for use in agricultural crops. As a result, information on the susceptibility of weeds

F. L. Dixon; D. V. Clay

2004-01-01

500

The effect of competition from different weed species on the growth of Betula pendula seedlings  

Microsoft Academic Search

The identification of less competitive weed species and infestation rates might allow weeding operations to be better targeted, help conserve local plant biodiversity, and facilitate reductions in the amount of herbicide used to achieve woodland regeneration. Therefore, the effect of competition from pure stands of Cirsium vulgare (Savi) Ten., Epilobium ciliatum Raf., Holcus lanatus L., Poa annua L., and Persicaria

Ian Willoughby; David V. Clay; Fiona L. Dixon; Geoff W. Morgan

2006-01-01