Detection of Sourgrass (<i>Digitaria insularis</i>) Biotypes Resistant to Glyphosate in Brazil

Carvalho, Leonardo Bianco de; Cruz-Hipólito, Hugo; González-Torralva, Fidel; Alves, Pedro Luís da Costa Aguiar; Christoffoleti, Pedro Jacob; Prado, Rafael De

doi:10.1614/ws-d-10-00113.1

Cited by 83 publications

(104 citation statements)

References 40 publications

(39 reference statements)

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“…Therefore, selecting for glyphosate-resistant biotypes of D. insularis has adverse impacts on the plants' growth and development ability, but absence of competition with the susceptible (more adapted) biotype and the ability to persist after chemical management may favor the dissemination in the resistant biotype environment (Vargas et al, 2005). Therefore, it is clear the importance of employing integrated weed management strategies in croplands to prevent not only weed interference in the development and management of cultures but also the selection for herbicide-resistant biotypes, so that the useful life of these products can be increased (Vila-Aiub et al, 2008;Carvalho et al, 2011;Gemelli et al, 2012;Norsworthy et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Growth and Development of Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

et al. 2017

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14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105 and 112 days after emergence. The growth curve of susceptible and resistant biotypes were similar; however, the susceptible biotypes accumulated more leaf dry mass, while the resistant one accumulated more root dry mass. The resistant biotypes exhibited greater competitive efficiency and produced fewer tillers and inflorescences. The resistant biotype of D. insularis would have advantages over the original population of susceptible biotypes in an environment without application of glyphosate due to the low potential of aboveground biomass production and reproduction.Keywords: growth analysis, chemical control, sourgrass, weeds. de 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105 RESUMO -Objetivou-se neste estudo avaliar o crescimento e desenvolvimento de biótipos de

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Section: Resultsmentioning

confidence: 99%

Growth and Development of Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

et al. 2017

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“…This species is found contaminating areas of pasture, grains and orchards and in ruderal areas, being considered one of the most problematic weeds in Brazil (Carvalho et al, 2011).…”

Section: Sourgrass (Digitaria Insularis)mentioning

confidence: 99%

Effects of Environmental Factors on Seed Germination and Emergence of Glyphosate Resistant and Susceptible Sourgrass

2017

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-Sourgrass is one of the most problematic weeds of Brazil. It is an aggressive species in the allocation of resources from the environment and reported to be glyphosate resistant in several states of the country. This work has aimed to verify environmental effects on seed germination and seedling emergence of sourgrass. Laboratory and field trials were conducted to determine the effects of temperature, light, photoperiod, water availability and depth of burial in germination and emergence of seeds. The maximum germination was greater than 80% for seed originated from resistant plants between 15 and 30 o C. For the susceptible ones, the maximum germination occurred only at 30 o C. Germination occurred for both biotypes independent of the presence of light. The best photoperiod for germination of both biotypes was between 8 and 14 hours. Seeds originated from resistant plants showed higher germination levels at low temperatures in the presence of light and in less water availability. There was no germination from -0,8 MPa for both biotypes. The emergence for both biotypes was low, indicating that seed burial could be used in the management of the species. Seeds from resistant plants showed higher and larger germination in temperatures, water content and depth of burial ranges than from originated from susceptible plants.Keywords: Digitaria insularis, water availability, photoperiod, seeds, temperature. RESUMO -O capim-amargoso é uma das espécies mais problemáticas da agricultura brasileira. É uma espécie agressiva na alocação de recursos do meio

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“…It should be noted that the application of glyphosate on a large scale has successively caused a very large selection pressure on agricultural areas, resulting in selection and predominance of weeds that are difficult to control and resistant biotypes (JONES et al, 2005;VILA-AIUB et al, 2007;OWEN, 2008;CARVALHO et al, 2011;GAINES et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Action of rain on formulations of glyphosate mixed with saflufenacil for the control of Brachiaria decumbens

et al. 2018

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RESUMO:O objetivo do trabalho foi avaliar a ocorrência de chuvas na eficiência de diferentes formulações de glyphosate aplicadas de forma isolada e em mistura com o saflufenacil, sobre o controle de Brachiaria decumbens. O estudo foi realizado no primeiro semestre de 2013. Os tratamentos constaram da aplicação isolada de três formulações de glyphosate (Roundup Original, Roundup Transorb R e Roundup WG) a 1.080 g e.a. ha -1 e em mistura com o saflufenacil a 24,5 g i.a. ha -1 + Dash a 0,5% v/v e, seis intervalos de tempo para simulação da chuva: 15; 30; 60; 120; 240 e 360 minutos após a aplicação dos herbicidas e uma testemunha sem chuva. Foram realizadas avaliações visuais de controle das plantas aos 4; 7; 14; 21 e 28 dias após a aplicação dos herbicidas. A mistura de saflufenacil + Dash às formulações de Roundup original, Roundup transorb R e Roundup WG aumentaram a velocidade de controle das plantas de B. decumbens, independente do intervalo de chuva estudado. As formulações de glyphosate (Roundup Transorb R e Roundup WG) aplicados isolados foram afetadas por chuvas que ocorreram logo após a pulverização e quando em mistura com saflufenacil + Dash observou-se efeito sinérgico no controle das plantas daninhas. PALAVRAS-CHAVE:Brachiaria; eficácia; herbicida; plantas daninhas. ABSTRACT:This study aimed to evaluate the effects of rain on the efficiency of different formulations of glyphosate applied in isolation and in combination with saflufenacil on the control of Brachiaria decumbens. This study was conducted during the first half of 2013. The treatments consisted of an isolated application of three formulations of glyphosate (Roundup Original, Roundup Transorb R, and Roundup WG) at 1,080 g a.e. ha -1 and mixed with saflufenacil at 24.5 g a.e. ha -1 + Dash at 0.5% v/v at six time intervals of simulated rain: 15, 30, 60, 120, 240 and 360 minutes after application of herbicides and a control treatment without rain. We performed visual evaluations of plant control at 4, 7, 14, 21 and 28 days after application of herbicides. The mixture of saflufenacil + Dash with the original Roundup formulations, Roundup Transorb R and Roundup WG increased the control speed of B. decumbens plants regardless of the rain interval studied. The formulations of glyphosate (Roundup Transorb R and Roundup WG) applied in isolation were affected by rains that occurred shortly after spraying. In combination with saflufenacil + Dash, there was a synergistic effect on weed control.

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Detection of Sourgrass (Digitaria insularis) Biotypes Resistant to Glyphosate in Brazil

Cited by 83 publications

References 40 publications

Growth and Development of Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Growth and Development of Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Effects of Environmental Factors on Seed Germination and Emergence of Glyphosate Resistant and Susceptible Sourgrass

Action of rain on formulations of glyphosate mixed with saflufenacil for the control of Brachiaria decumbens

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