The Effect of Labeling Herbicides with Their Site of Action: A Canadian Perspective

1999 ◽  
Vol 13 (3) ◽  
pp. 655-661 ◽  
Author(s):  
Hugh J. Beckie ◽  
Fa-Yan Chang ◽  
F. Craig Stevenson
Keyword(s):  
Public Sector ◽  
Herbicide Resistance ◽  
Crop Protection ◽  
Resistance Management ◽  
Extension Agents ◽  
Group Number ◽  
Site Of Action ◽  
Canadian Perspective ◽  
Group Rotation ◽  
Herbicide Use

Industry, public-sector researchers and extension agents, and growers were surveyed in 1998 to determine their perspectives on how labeling herbicides with their site of action (group number) would affect the herbicide use practices of growers. The crop protection industry in Canada represented by the Crop Protection Institute (CPI) generally supports herbicide resistance labeling but has some concerns regarding the wording of the labels, including the identification symbol. Most researchers and extension agents believe that labeling herbicides with their site of action will facilitate herbicide group rotation by growers who frequently use herbicides from the same group. Of the two-thirds of the 126 surveyed growers who were familiar with herbicide groupings, 58% practiced herbicide group rotation. Those who did not tended to lack understanding of the basis and purpose of herbicide classification. Grower responses were similar to those from the research and extension community, although only 29% of the growers who currently do not rotate herbicides from different groups believed that resistance management labeling would influence them.

scholarly journals Herbicide Resistance Management in Florida Tomato Production

EDIS ◽  
2020 ◽  
Vol 2020 (6) ◽  
Author(s):  
Shaun Sharpe ◽  
N S Boyd ◽  
Ramdas G Kanissery ◽  
Peter Dittmar
Keyword(s):  
Herbicide Resistance ◽  
Resistance Management ◽  
Extension Agents ◽  
Tomato Production ◽  
Herbicide Resistant ◽  
Horticultural Crops ◽  
Agronomic Crops ◽  
Small Fruit ◽  
Definition Of ◽  
Management Recommendations

Herbicide resistance was historically not a significant issue in most horticultural crops because few herbicides were applied. Close proximity of agronomic crops and the loss of methyl bromide has led to a gradual increase in herbicide inputs and the increased occurrence of herbicide-resistant weeds in tomato fields. Very few herbicides are registered for tomato, and resistance is a major concern. This new 11-page publication of the UF/IFAS Horticultural Sciences Department provides a definition of herbicide resistance, explains how it develops, and provides management recommendations for tomato growers. It was written for growers and Extension agents, but the information may be of interest to anyone concerned about herbicide resistance in vegetable and small fruit crops. Written by Shaun M. Sharpe, Nathan S. Boyd, Ramdas G. Kanissery, and Peter J. Dittmar.https://edis.ifas.ufl.edu/hs1398

scholarly journals Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Plants ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 469 ◽  
Author(s):  
Vila-Aiub
Keyword(s):  
Life History ◽  
Herbicide Resistance ◽  
Management Practices ◽  
Current Knowledge ◽  
Resistance Management ◽  
Fitness Cost ◽  
Plant Fitness ◽  
Resistance Mutations ◽  
Fitness Costs ◽  
Wide Range

Herbicide resistance is the ultimate evidence of the extraordinary capacity of weeds to evolve under stressful conditions. Despite the extraordinary plant fitness advantage endowed by herbicide resistance mutations in agroecosystems under herbicide selection, resistance mutations are predicted to exhibit an adaptation cost (i.e., fitness cost), relative to the susceptible wild-type, in herbicide untreated conditions. Fitness costs associated with herbicide resistance mutations are not universal and their expression depends on the particular mutation, genetic background, dominance of the fitness cost, and environmental conditions. The detrimental effects of herbicide resistance mutations on plant fitness may arise as a direct impact on fitness-related traits and/or coevolution with changes in other life history traits that ultimately may lead to fitness costs under particular ecological conditions. This brings the idea that a “lower adaptive value” of herbicide resistance mutations represents an opportunity for the design of resistance management practices that could minimize the evolution of herbicide resistance. It is evident that the challenge for weed management practices aiming to control, minimize, or even reverse the frequency of resistance mutations in the agricultural landscape is to “create” those agroecological conditions that could expose, exploit, and exacerbate those life history and/or fitness traits affecting the evolution of herbicide resistance mutations. Ideally, resistance management should implement a wide range of cultural practices leading to environmentally mediated fitness costs associated with herbicide resistance mutations.

scholarly journals Seed production of barnyardgrass (Echinochloa crus-galli) in response to time of emergence in cotton and rice

2011 ◽  
Vol 150 (6) ◽  
pp. 717-724 ◽  
Author(s):  
M. V. BAGAVATHIANNAN ◽  
J. K. NORSWORTHY ◽  
K. L. SMITH ◽  
P. NEVE
Keyword(s):  
United States ◽  
Seed Production ◽  
Herbicide Resistance ◽  
Crop Production ◽  
Integrated Management ◽  
Resistance Management ◽  
Simulation Models ◽  
Effective Resistance ◽  
Southern United States

SUMMARYThe spread of herbicide resistance in barnyardgrass (Echinochloa crus-galli(L.) Beauv.) poses a serious threat to crop production in the southern United States. A thorough knowledge of the biology of barnyardgrass is fundamental for designing effective resistance-management programmes. In the present study, seed production of barnyardgrass in response to time of emergence was investigated in cotton and rice, respectively, in Fayetteville and Rohwer, Arkansas, over a 2-year period (2008–09). Barnyardgrass seed production was greater when seedlings emerged with the crop, but some seed production was observed even if seedlings emerged several weeks after crop emergence. Moreover, barnyardgrass seed production was highly variable across environments. When emerging with the crop (0 weeks after crop emergence (WAE)), barnyardgrass producedc. 35 500 and 16 500 seeds/plant in cotton, andc. 39 000 and 2900 seeds/plant in rice, in 2008 and 2009, respectively. Seed production was observed when seedlings emerged up to 5 WAE (2008) or 7 WAE (2009) in cotton and up to 5 WAE (2008, 2009) in rice; corresponding seed production wasc. 2500 and 1500 seeds/plant in cotton, andc. 14 700 and 110 seeds/plant in rice, in 2008 and 2009, respectively. The results suggest that cultural approaches that delay the emergence of barnyardgrass or approaches that make the associated crop more competitive will be useful in integrated management programmes. In the context of herbicide resistance management, it may be valuable to prevent seed return to the seedbank, irrespective of cohorts. The findings are vital for parameterizing herbicide resistance simulation models for barnyardgrass.

scholarly journals Managing Herbicide Resistance: Listening to the Perspectives of Practitioners. Procedures for Conducting Listening Sessions and an Evaluation of the Process

2018 ◽  
Vol 32 (4) ◽  
pp. 489-497 ◽  
Author(s):  
Jill Schroeder ◽  
Michael Barrett ◽  
David R. Shaw ◽  
Amy B. Asmus ◽  
Harold Coble ◽  
...  
Keyword(s):  
Small Group ◽  
Herbicide Resistance ◽  
Planning Process ◽  
Resistance Management ◽  
Time Of Day ◽  
Full Group ◽  
Group Discussions ◽  
Small Group Discussions ◽  
The Subject ◽  
Selection Of

AbstractSeven half-day regional listening sessions were held between December 2016 and April 2017 with groups of diverse stakeholders on the issues and potential solutions for herbicide-resistance management. The objective of the listening sessions was to connect with stakeholders and hear their challenges and recommendations for addressing herbicide resistance. The coordinating team hired Strategic Conservation Solutions, LLC, to facilitate all the sessions. They and the coordinating team used in-person meetings, teleconferences, and email to communicate and coordinate the activities leading up to each regional listening session. The agenda was the same across all sessions and included small-group discussions followed by reporting to the full group for discussion. The planning process was the same across all the sessions, although the selection of venue, time of day, and stakeholder participants differed to accommodate the differences among regions. The listening-session format required a great deal of work and flexibility on the part of the coordinating team and regional coordinators. Overall, the participant evaluations from the sessions were positive, with participants expressing appreciation that they were asked for their thoughts on the subject of herbicide resistance. This paper details the methods and processes used to conduct these regional listening sessions and provides an assessment of the strengths and limitations of those processes.

scholarly journals Chemical Control of Glyphosate-Resistant Goosegrass

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
H.K. TAKANO ◽  
R.S. OLIVEIRA JR. ◽  
J. CONSTANTIN ◽  
V.F.V. SILVA ◽  
R.R. MENDES
Keyword(s):  
Herbicide Resistance ◽  
Chemical Control ◽  
Resistance Management ◽  
Effective Management ◽  
Greenhouse Experiments ◽  
Modes Of Action

ABSTRACT: The use of mixtures and rotation of herbicide modes of action are essential for herbicide resistance management. The purpose of this research was to evaluate different pre- and post-emergence herbicides to control goosegrass in soybean and corn. Four greenhouse experiments were conducted, one in pre-emergence and the three others in post-emergence. In pre-emergence, the number of emerged plants and the control percentage at 20, 35 and 50 days after application were evaluated. In post-emergence, the control percentage was evaluated at 14 and 28 days after application on plants with one tiller and four tillers. The use of residual herbicides to control glyphosate-resistant goosegrass is a very important tool for its effective management. The application stage is also crucial for post-emergence efficacy. Paraquat and [paraquat + diuron] are effective in controlling this species. The application of ACCase inhibiting herbicides alone seems to be more effective than their associations with glyphosate, especially in plants with four tillers. HPPD inhibiting herbicides have high synergism with atrazine and not with glyphosate.

Use of crop protection chemicals for integrated pest control

1981 ◽  
Vol 295 (1076) ◽  
pp. 125-141 ◽  
Keyword(s):  
Chemical Control ◽  
Crop Production ◽  
Crop Protection ◽  
Resistance Management ◽  
Control Programme ◽  
Pyrethroid Insecticides ◽  
Application Techniques ◽  
Integrated Pest Control ◽  
Arthropod Pest ◽  
Pest Management Systems

Examples of and methods for achieving the selective use of pesticides in control of pests while conserving important beneficial natural enemies are discussed relative to the development of integrated pest management systems for apples in the U.S.A. Included are examples of physiologically selective acaricides, ecological selectivity conferred by application techniques and selectivity due to the development of resistant beneficial insects. A definition and examples of ideal selectivity of pesticides for this crop production system are discussed. Lastly, an approach to resistance management in an entire apple arthropod pest - natural enemy complex is discussed in relation to a long-used chemical control system (organophosphate pesticides) compared with a new chemical control programme based on pyrethroid insecticides.

Changes in Herbicide Use Patterns and Production Practices Resulting from Glyphosate-Resistant Crops

2006 ◽  
Vol 20 (2) ◽  
pp. 301-307 ◽  
Author(s):  
Bryan G. Young
Keyword(s):  
Weed Management ◽  
Management Strategy ◽  
Crop Production ◽  
Large Scale ◽  
Resistance Management ◽  
Use Patterns ◽  
No Till ◽  
Production Practices ◽  
Sites Of Action ◽  
Herbicide Use

Recent shifts in herbicide use patterns can be attributed to rapid, large-scale adoption of glyphosate-resistant soybean and cotton. A dramatic increase in glyphosate use is the most obvious change associated with the adoption of glyphosate-resistant crops. Consequently, the diversity of herbicides used for weed management in these crops has declined, particularly in soybean. To date, the availability of glyphosate-resistant corn has limited the use of glyphosate in corn. While exploiting the benefits of glyphosate-resistant crops, many growers have abandoned the principles of sound weed and herbicide-resistance management. Instead of incorporating glyphosate into a resistance management strategy utilizing multiple herbicide sites of action, many growers rely exclusively upon glyphosate for weed control. Although it is difficult to establish a clear relationship between the adoption of glyphosate-resistant crops and changes in other crop production practices, the increase in no-till and strip-till production of cotton and soybean between 1995 and 2002 may have been facilitated by glyphosate-resistant crops.

Field and producer survey of ACCase resistant wild oat in Manitoba

1997 ◽  
Vol 77 (4) ◽  
pp. 709-715 ◽  
Author(s):  
Luc Bourgeois ◽  
Ian N. Morrison ◽  
David Kelner
Keyword(s):  
High Risk ◽  
Herbicide Resistance ◽  
Wild Oat ◽  
Medium Risk ◽  
Risk Areas ◽  
Resistance Assessment ◽  
Herbicide Use ◽  
Risk Categories ◽  
Weed Survey ◽  
Group 1

In a previous study, 729 townships in Manitoba were differentiated as being at low, medium, or high risk of evolving wild oat resistant to Group 1 herbicides based on herbicide use histories from 1981 to 1993. In the present study, 16 townships representing the three risk categories were surveyed in 1994 in order to determine the percentage of resistant wild oat patches. As well, a questionnaire was mailed to farmers in these townships requesting information on practices and attitudes relating to herbicide resistance. The wild oat survey consisted of sampling seed from conspicuous wild oat patches visible from north-south roads in each township. A total of 533 samples were collected and screened with fenoxaprop-P and sethoxydim using a bioassay. An average of eight resistant wild oat patches was found in the high risk townships. This was significantly higher than in low and medium risk townships where an average of less than one resistant wild oat patch per township was detected. The attitude of producers towards herbicide resistance was similar in all risk categories. However, the number of respondents suspecting Group 1 resistance on their farms was related to risk categories with producers in high risk areas suspecting the most cases of resistance. Key words: Weed survey, resistance assessment, wild oat, ACCase inhibitors

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