Benchmark study on glyphosate‐resistant crop systems in the United States. Economics of herbicide resistance management practices in a 5 year field‐scale study

Edwards, C.; Jordan, David L.; Owen, Michael D.; Dixon, Philip M.; Young, Bryan G.; Wilson, R. G.; Weller, S. C.; Shaw, David R.

doi:10.1002/ps.3759

Cited by 26 publications

(29 citation statements)

References 27 publications

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“…It is possible to consider that the strategies for managing resistance and mitigation are well understood by producers, even if few strategies have been implemented, primarily considering the economic argument (Edwards et al, 2014). In most cases, producers have adopted the most convenient and economical management practices until a critical event promotes the paradigm shift (Burgos et al, 2013).…”

Section: Continued Use Of Rrmentioning

confidence: 99%

Agronomic factors involved in low-level wild poinsettia resistance to glyphosate

Ulguim

Agostinetto

Várgas

et al. 2017

Agraria

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The awareness of agronomic practices that affect the resistance selection of weeds to a particular herbicide is of utmost importance in order to advocate management practices that aim to avoid or prolong the resistance. The objectives of this study were to identify and map the occurrence of the wild poinsettia's low-level resistance to glyphosate in Rio Grande do Sul State (RS), Brazil, and to define the main agronomic factors associated with the selection of these biotypes. Seed and / or soil samples in areas with suspected resistance were collected in Roundup Ready ® (RR) soybean crops in different counties in the RS region during the 2010/11 and 2011/12 seasons. A questionnaire on the operations history in the area was applied at each site in order to establish relationships between the distribution of wild poinsettia with cases of suspected resistance to glyphosate and the likely agronomic factors involved in this occurrence. The study included the response of wild poinsettia biotypes with suspected resistance to glyphosate and an analysis of the questionnaires carried out with producers. The main agronomic practices used by producers that favor the emergence of resistant biotypes were the continued cultivation of the RR ® soybean; an overdependence on the use of glyphosate; a low rate of crop rotation and efficient chemical alternatives for wild poinsettia control and management.Key words: crop rotation; 5-enolpiruvil chiquimato 3-fosfato sintase; Euphorbia heterophylla; selection pressure Fatores agronômicos envolvidos na resistência de nível baixo de leiteira a glyphosate RESUMOO conhecimento das práticas agronômicas que interferem na seleção de plantas resistentes a determinado herbicida é de extrema importância para preconizar práticas de manejo que visem evitar ou retardar a resistência. Os objetivos do trabalho foram identificar e mapear a ocorrência da resistência de nível baixo de leiteira ao glyphosate no Rio Grande do Sul (RS), e definir os pricipais fatores agronômicos associados na seleção desses biótipos. Amostras de sementes e/ou solo em áreas com a suspeita de resistência foram coletadas em lavouras de soja Roundup Ready ® em diferentes Municípios do RS nas safras 2010/11 e 2011/12. Em cada local, foi aplicado questionário sobre o histórico de manejo da área, visando estabelecer relações entre a distribuição de casos de leiteira com suspeita de resistência ao glyphosate e os prováveis fatores agronômicos envolvidos nessa característica. O estudo constou da resposta dos biótipos de leiteira com suspeita de resistência ao glyphosate e análise dos questionários realizados com os produtores. As principais práticas agronômicas utilizadas pelos produtores que favorece o surgimento de biótipos resistentes foi o cultivo continuado de soja RR ® , excessiva dependência do uso de glyphosate, baixo índice de rotação de culturas e de alternativas químicas eficientes para o controle de leiteira.

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Section: Continued Use Of Rrmentioning

confidence: 99%

Agronomic factors involved in low-level wild poinsettia resistance to glyphosate

Ulguim

Agostinetto

Várgas

et al. 2017

Agraria

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“…[97] This means that growers can adopt BMP with confidence that they will not negatively affect their net returns in the short-term, and will help mitigate HR weed problem in the long-term. To provide similar practical examples in Europe, it is crucial that demonstration trials that include IWM practices integrated within crop rotation systems involving HT crops are supported.…”

Section: Demonstrate To Growers With Practical Examples That Bmp Leadmentioning

confidence: 99%

“…Indeed, numerous studies have highlighted that growers in the US are not fully committed to adopt mitigation strategies. [32,114] In the Benchmark Study in the Midwest and southern US, [97] the authors reported that the management of HR weeds based on integrated practices as recommended by academics was sustainable from economic and agronomic points of view, but the challenge was to convince growers to adopt such practices. They showed that alternative weed control strategies are not significantly accepted and adopted even by growers that were aware that these strategies would lead to better results.…”

Section: Foster Awareness-raising Programs and Coordinated Responsesmentioning

confidence: 99%

Integrated weed management systems with herbicide-tolerant crops in the European Union: lessons learnt from home and abroad

Lamichhane

Devos

Beckie

et al. 2016

Critical Reviews in Biotechnology

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Conventionally bred (CHT) and genetically modified herbicide-tolerant (GMHT) crops have changed weed management practices and made an important contribution to the global production of some commodity crops. However, a concern is that farm management practices associated with the cultivation of herbicide-tolerant (HT) crops further deplete farmland biodiversity and accelerate the evolution of herbicide-resistant (HR) weeds. Diversification in crop systems and weed management practices can enhance farmland biodiversity, and reduce the risk of weeds evolving herbicide resistance. Therefore, HT crops are most effective and sustainable as a component of an integrated weed management (IWM) system. IWM advocates the use of multiple effective strategies or tactics to manage weed populations in a manner that is economically and environmentally sound. In practice, however, the potential benefits of IWM with HT crops are seldom realized because a wide range of technical and socio-economic factors hamper the transition to IWM. Here, we discuss the major factors that limit the integration of HT crops and their associated farm management practices in IWM systems. Based on the experience gained in countries where CHT or GMHT crops are widely grown and the increased familiarity with their management, we propose five actions to facilitate the integration of HT crops in IWM systems within the European Union.ARTICLE HISTORY

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“…A 2011 survey in the Mid-South testified that some BMPs, particularly cultural practices, are implemented in a limited manner because of time constraints, weather, extra costs, and a certain difficulty for some farmers in adopting a proactive strategy when they have not experienced resistant weeds on their own farms (Riar et al 2013). Yet, a detailed benchmark study in more than a hundred farm fields, comparing costs, yields, and net returns between growers' standard weed management and BMPs, showed that, despite their higher costs, BMPs could lead to the same net returns (Edwards et al 2014). In a late 2012 survey of Certified Crop Advisors, 40 % said that farmers would only adopt BMPs if resistant weeds became a problem in their fields (Asmus et al 2013).…”

Section: Farmer Attitudesmentioning

confidence: 99%

Genetically Modified Herbicide-Tolerant Crops, Weeds, and Herbicides: Overview and Impact

Bonny

2015

Environmental Management

154

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Genetically modified (GM) crops have been and continue to be a subject of controversy despite their rapid adoption by farmers where approved. For the last two decades, an important matter of debate has been their impact on pesticide use, particularly for herbicide-tolerant (HT) crops. Some claim that these crops bring about a decrease in herbicide use, while others claim the opposite. In fact, since 1996, most cultivated GMOs have been GMHT crops, which involve the use of an associated herbicide, generally glyphosate. In their very first years of adoption, HT crops often led to some decrease in herbicide use. However, the repetition of glyphosate-tolerant crops and of glyphosate only applications in the same fields without sufficient alternation and herbicide diversity has contributed to the appearance of glyphosate-resistant weeds. These weeds have resulted in a rise in the use of glyphosate and other herbicides. This article explores this situation and the impacts of herbicide-resistant weeds, using an interdisciplinary approach and drawing on recent data. The paper analyzes the spread of GMHT crops worldwide and their consequences on herbicide use in the USA in particular. It then addresses the global development of glyphosate-resistant weeds and their impact, particularly focusing on the USA. Finally, the last section explores how industry, farmers, and weed scientists are coping with the spread of resistant weeds. The concluding comments deal more widely with trends in GM crops.

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Benchmark study on glyphosate‐resistant crop systems in the United States. Economics of herbicide resistance management practices in a 5 year field‐scale study

Cited by 26 publications

References 27 publications

Agronomic factors involved in low-level wild poinsettia resistance to glyphosate

Agronomic factors involved in low-level wild poinsettia resistance to glyphosate

Integrated weed management systems with herbicide-tolerant crops in the European Union: lessons learnt from home and abroad

Genetically Modified Herbicide-Tolerant Crops, Weeds, and Herbicides: Overview and Impact

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