Managing Wicked Herbicide-Resistance: Lessons from the Field

Schroeder, Jill; Barrett, Michael; Shaw, David R.; Asmus, Amy; Coble, Harold D.; Ervin, David E.; Jussaume, Raymond A.; Owen, Micheal D. K.; Burke, Ian C.; Creech, Cody F.; Culpepper, A. Stanley; Curran, William S.; Dodds, Darrin M.; Gaines, Todd A.; Gunsolus, Jeffrey L.; Hanson, Bradley D.; Jha, Prashant; Klodd, Annie; Kniss, Andrew R.; León, Ramón G.; McDonald, Sandra K.; Morishita, Don W.; Schutte, Brian J.; Sprague, Christy L.; Stahlman, Phillip W.; Steckel, Larry; VanGessel, Mark J.

doi:10.1017/wet.2018.49

Cited by 25 publications

(38 citation statements)

References 37 publications

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“…However, this is the first time that all traits introduced on the market will already have resistant weed species present somewhere in the US [3]. The development of new herbicide-resistant crops coincides with the grower expectation that new technology will solve herbicide resistance issues [18]. These new trait technologies will require proper stewardship, which includes implementing an Integrated Weed Management (IWM) strategy, using cultural, mechanical, biological, and chemical methods at the appropriate timing [19], and implementing Best Management Practices (BMPs), which are recommendations which may or may not include IWM strategies, to slow the evolution and spread of herbicide-resistant weeds [20].…”

Section: Reliance On Herbicide-resistant Cropsmentioning

confidence: 99%

Emerging Challenges for Weed Management in Herbicide-Resistant Crops

2019

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Since weed management is such a critical component of agronomic crop production systems, herbicides are widely used to provide weed control to ensure that yields are maximized. In the last few years, herbicide-resistant (HR) crops, particularly those that are glyphosate-resistant, and more recently, those with dicamba (3,6-dichloro-2-methoxybenzoic acid) and 2,4-D (2,4-dichlorophenoxyacetic acid) resistance are changing the way many growers manage weeds. However, past reliance on glyphosate and mistakes made in stewardship of the glyphosate-resistant cropping system have directly led to the current weed resistance problems that now occur in many agronomic cropping systems, and new technologies must be well-stewarded. New herbicide-resistant trait technologies in soybean, such as dicamba-, 2,4-D-, and isoxaflutole- ((5-cyclopropyl-4-isoxazolyl)[2-(methylsulfonyl)-4-(trifluoromethyl)phenyl]methanone) resistance, are being combined with glyphosate- and glufosinate-resistance traits to manage herbicide-resistant weed populations. In cropping systems with glyphosate-resistant weed species, these new trait options may provide effective weed management tools, although there may be increased risk of off-target movement and susceptible plant damage with the use of some of these technologies. The use of diverse weed management practices to reduce the selection pressure for herbicide-resistant weed evolution is essential to preserve the utility of new traits. The use of herbicides with differing sites of action (SOAs), ideally in combination as mixtures, but also in rotation as part of a weed management program may slow the evolution of resistance in some cases. Increased selection pressure from the effects of some herbicide mixtures may lead to more cases of metabolic herbicide resistance. The most effective long-term approach for weed resistance management is the use of Integrated Weed Management (IWM) which may build the ecological complexity of the cropping system. Given the challenges in management of herbicide-resistant weeds, IWM will likely play a critical role in enhancing future food security for a growing global population.

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Section: Reliance On Herbicide-resistant Cropsmentioning

confidence: 99%

Emerging Challenges for Weed Management in Herbicide-Resistant Crops

2019

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“…More high-residue cover crop options besides cereal rye are needed to diversify this practice. In a survey of non-organic grower perceptions on herbicide resistance management, growers have suggested that cover crops can present challenges, and there are few available profitable crops to rotate with corn and soybean [13]. Diversity in crop rotations is recognized as an effective herbicide resistance management tactic because different herbicide sites of action can be used on different crops, which can diversify this management tactic [25].…”

Section: Cover Cropsmentioning

confidence: 99%

“…Grower networks could be a valuable support tool, and would allow for the sharing of specialty equipment, such as interseeders, cover crop roller crimpers, industrial hemp decorticators for fiber, etc. One of the most successful approaches in herbicide resistance management has been a community-based approach, where growers design programs to manage herbicide-resistant weeds in cooperation with academic, government, and industry representatives [13,19]. Growers may feel that herbicide resistance issues will worsen because of the action of their neighbors or others throughout the region, a common pool social dilemma [13,20], however, encouragement should be provided by studies [21,22], which show that following a robust management program, even when other nearby farmers are not, will still result in a higher return on investment compared to not using best management practices [13].…”

mentioning

confidence: 99%

“…One of the most successful approaches in herbicide resistance management has been a community-based approach, where growers design programs to manage herbicide-resistant weeds in cooperation with academic, government, and industry representatives [13,19]. Growers may feel that herbicide resistance issues will worsen because of the action of their neighbors or others throughout the region, a common pool social dilemma [13,20], however, encouragement should be provided by studies [21,22], which show that following a robust management program, even when other nearby farmers are not, will still result in a higher return on investment compared to not using best management practices [13]. A grower network, such as the one initiated in two counties in Arkansas, United States, for control of HR Palmer amaranth, may be helpful in tackling the landscape-scale issue of herbicide resistance and weed evolution [7,23]; solutions will need to be coordinated across property lines and geopolitical boundaries [20].…”

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confidence: 99%

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Shifting the Paradigm: An Ecological Systems Approach to Weed Management

Gage

Schwartz-Lazaro

2019

Agriculture

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Weeds have been historically, and are still today, the primary and most economically important pest in agriculture. Several selection pressures associated with weed management, such as an overreliance on herbicides, have promoted the rapid evolution of herbicide-resistant weeds. Integrated Weed Management (IWM) is promoted as an ecological systems approach, through the combination of biological, chemical, cultural, ecological, and mechanical control methods. The concept of a systems approach is defined as managing weeds by combining practice and knowledge with the goals of increasing yield and minimizing economic loss, minimizing risks to human health and the environment, and reducing energy requirements and off-target impacts. The reliance on herbicides in modern cropping systems has shifted the management focus from requiring intimate knowledge of biology, ecology, and ecological systems to herbicide chemistry, mixes, and rotations, application technology, and herbicide-tolerant crop traits. Here, an ecological systems approach is considered, examining new trends and technologies in relation to IWM and weed ecology. Prevention of spread, seedbank management, crop rotations, tillage, cover crops, competitive cultivars, biological weed control, and future solutions in concept-only are presented, and knowledge gaps are identified where research advancements may be possible. An ecological systems approach will provide improved stewardship of new herbicide technologies and reduce herbicide resistance evolution through diversification of selection pressures. Agroecological interactions should be studied in light of new, developing weed control technologies. The science of weed management needs to refocus on the foundations of weed biology and ecology to enable an ecological systems approach and promote agricultural sustainability.

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“…Farmers appear to share concern over such disincentive effects. The Herbicide Resistance Education Committee (HREC) of the Weed Science Society of America (WSSA) held several listening sessions around the USA to better understand farmer motivations, concerns, and challenges in adopting herbicide resistance management practices . Land tenure (whether a farmer owned or rented land) was among seven primary areas of economic concern that farmers identified.…”

Section: Introductionmentioning

confidence: 99%

Do farmers manage weeds on owned and rented land differently? Evidence from US corn and soybean farms

Frisvold

Albright

Ervin

et al. 2020

Pest Management Science

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BACKGROUND: It has been frequently argued that growers have less incentive to manage the evolution and spread of herbicide-resistant weeds on leased than on owned land. This is because resistance management provides long-term rather than short-term benefits that operators may be less assured of capturing on land they do not own. Yet, empirical evidence supporting this argument has been lacking.RESULTS: This study reports on results from a large-scale national survey of weed management and other crop production practices on US agricultural fields. Up to 11 weed management practices were compared across owner-operated versus renteroperated fields. Analysis of survey data from corn and soybean fields did not support the hypothesis that adoption of resistance management practices is lower on rented acres. In most instances, there were no statistically significant differences in herbicide use or weed management practices on rented versus owned land. This was true at both national and regional levels of analysis. Where there were significant differences, practices associated with greater herbicide resistance management were, as often as not, more prevalent on rented than owned land.CONCLUSIONS: A useful area of future research would be to test for land tenure differences in resistance management using multivariate analysis to control for confounding effects. Unobserved farmer or land characteristics may be confounding results and masking land tenure effects. Results here, however, suggest that these other effects are dominating any obvious disincentive effects of land leasing on resistance management. Of greater concern, the adoption of key resistance management practices was low on both owned and rented land.

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Managing Wicked Herbicide-Resistance: Lessons from the Field

Cited by 25 publications

References 37 publications

Emerging Challenges for Weed Management in Herbicide-Resistant Crops

Emerging Challenges for Weed Management in Herbicide-Resistant Crops

Shifting the Paradigm: An Ecological Systems Approach to Weed Management

Do farmers manage weeds on owned and rented land differently? Evidence from US corn and soybean farms

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