Benchmark study on glyphosate‐resistant cropping systems in the United States. Part 3: Grower awareness, information sources, experiences and management practices regarding glyphosate‐resistant weeds

Givens, Wade A.; Shaw, David R.; Newman, Morris; Weller, Stephen C.; Young, Bryan G.; Wilson, R. G.; Owen, Micheal D. K.; Jordan, David L.

doi:10.1002/ps.2178

Cited by 29 publications

(46 citation statements)

References 21 publications

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“…A utilização de doses corretas do glifosato, na época e no estádio adequados das plantas daninhas (Givens et al, 2011), é considerada prática importante pelos produtores para reduzir a ocorrência de resistência a este herbicida. Constatou-se que, na maior parte das lavouras amostradas, a dose de glifosato utilizada, tanto para a dessecação pré-semeadura (67%) (Figura 2 B) como para as aplicações em pós-emergência (54%), encontra-se entre 720 e 1.080 g ha -1 do e.a.…”

Section: Resultsunclassified

“…O uso de herbicidas com efeito residual é uma estratégia eficiente, indicada para o manejo de plantas daninhas resistentes ao glifosato em lavouras de soja RR, nos Estados Unidos (Owen et al, 2011). Contudo, é importante salientar que esses herbicidas proporcionam aumento da pressão de seleção, por permitirem o controle de diferentes fluxos de emergência de plantas daninhas.…”

Section: Resultsunclassified

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Manejo de capim pé-de-galinha em lavouras de soja transgênica resistente ao glifosato

Ulguim

Várgas

Agostinetto

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a resistência de capim pé-de-galinha (Eleusine indica) ao glifosato, em lavouras de soja transgênica; avaliar o efeito de aplicações de glifosato em diferentes estádios de desenvolvimento; identificar práticas agronômicas associadas à seleção de biótipos resistentes; e avaliar a eficiência dos herbicidas cletodim, fluazifope-P-butílico, clomazona, glufosinato de amônio e glifosato nas plantas resistentes. Plantas escapes ao tratamento com glifosato foram coletadas em 24 propriedades, no Rio Grande do Sul. As plantas foram cultivadas em casa de vegetação, tendo-se avaliado a sua resistência ao glifosato. Os acessos resistentes foram selecionados e avaliados quanto ao efeito da aplicação do glifosato em diferentes estádios de crescimento e quanto à sensibilidade aos herbicidas. Foi aplicado um questionário aos produtores para identificação das práticas agronômicas associadas às falhas no controle. O controle de E. indica pelo glifosato é mais efetivo com a aplicação em estádios iniciais de desenvolvimento. Práticas agronômicas, como uso contínuo de baixas doses do herbicida, aplicação em estádios de desenvolvimento avançados das plantas daninhas (mais de um afilho) e a ausência de rotação de culturas foram relacionadas às falhas de controle observadas. Os herbicidas cletodim, fluazifope-P-butílico e glufosinato de amônio são alternativas eficientes para o controle de E. indica.Termos para indexação: Eleusine indica, Glycine max, dosagem, eficiência de controle, estádio fenológico, resistência ao glifosato, roundup ready. Management of goose grass on transgenic soybean, resistant to glyphosateAbstract -The objective of this work was to evaluate the resistance of goose grass (Eleusine indica) to glyphosate application in transgenic soybean crops; evaluate the effect of glyphosate applications in different growth stages; identify the main agronomic practices associated with the selection of resistant biotypes; and evaluate the effect of the herbicides clethodim, fluazifop-p-butyl, clomazone, glufosinate ammonium, and glyphosate on resistant plants. Plants that survived glyphosate application were collected on 24 properties in the state of Rio Grande do Sul, Brazil. Plants were grown in greenhouse and their resistance to glyphosate was evaluated. The resistant accessions were selected and evaluated as to the effect of glyphosate application on different growth stages and to their sensitivity to the herbicides. A questionnaire was given to producers in order to identify agronomic practices associated with control failures. The control of E. indica by glyphosate is more effective at initial growth stages. Agronomic practices, such as continued use of low doses of glyphosate, application on advanced weed growth stages (more than one tiller), and absence of crop rotation were related to the observed control failures. The herbicides clethodim, fluazifop-p-butyl, and glufosinate ammonium are efficient alternatives to control E. indica.

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Section: Resultsunclassified

Manejo de capim pé-de-galinha em lavouras de soja transgênica resistente ao glifosato

Ulguim

Várgas

Agostinetto

et al. 2013

Pesq. agropec. bras.

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“…Indeed, since 2005-2006, cultural practices have begun to change, given the increasing extent of GR weeds and also the advice provided by weed scientists, grower associations, advisors, and seed companies (Givens et al 2011;Livingstone et al 2015). Farmers have more often applied other herbicides in addition to glyphosate (Figs.…”

Section: Farmer Attitudesmentioning

confidence: 98%

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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“…The agricultural input supply network includes agricultural chemical, seed, and equipment companies; the distribution chain; and the retail outlets that supply those products to growers. That network is often the final and most influential source of weed management information for growers in terms of products used (Givens et al 2011;Johnson et al 2009). The network members, therefore, must be challenged to consider how providing current, credible, scientifically sound, and nonbiased information to their grower clients can be included in and enhance their business plan.…”

Section: Roles In Herbicide Resistancementioning

confidence: 99%

Government Success in Partnerships: The USDA-ARS Areawide Ecologically Based Invasive Annual Grass Management Program

Smith

Sheley

2012

Rangelands

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Benchmark study on glyphosate‐resistant cropping systems in the United States. Part 3: Grower awareness, information sources, experiences and management practices regarding glyphosate‐resistant weeds

Cited by 29 publications

References 21 publications

Manejo de capim pé-de-galinha em lavouras de soja transgênica resistente ao glifosato

Manejo de capim pé-de-galinha em lavouras de soja transgênica resistente ao glifosato

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

Government Success in Partnerships: The USDA-ARS Areawide Ecologically Based Invasive Annual Grass Management Program

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