Manejo químico de plantas adultas de Digitaria insularis com glyphosate isolado e em mistura com chlorimuronethyl ou quizalofop-p-tefuril em área de plantio direto

Correia, Núbia Maria; Durigan, Júlio Cézar

doi:10.1590/s0006-87052009000300016

Cited by 18 publications

(19 citation statements)

References 4 publications

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“…No trabalho sobre absorção e translocação de 14 C-glyphosate em biótipos suscetíveis e resistentes de C. bonariensis, Ferreira et al (2008) mencionaram que o mecanismo de resistência está relacionado à translocação diferencial desse herbicida nos biótipos, pois houve maior concentração do 14 C-glyphosate absorvido nas folhas, no caule e nas raízes do biótipo suscetível comparado ao biótipo resistente, que apresentou maior acúmulo apenas na folha tratada. Para Lolium rigidum e L. multiflorum, Preston et al (2009) mencionaram que foram identificados dois mecanismos de resistência ao glyphosate: a alteração do sítio de ação devido à substituição na posição 106 da enzima EPSPS de prolina para treonina, alanina ou serina; e a translocação reduzida do herbicida das folhas para as raízes.…”

Section: Resultsunclassified

“…Apesar da dificuldade do controle químico de plantas adultas de capim-amargoso, obtêm-se resultados satisfatórios utilizando-se doses mais elevadas de glyphosate ou a sua associação com outros herbicidas (Procópio et al, 2006a). No entanto, em algumas áreas agríco-las do Centro-Sul brasileiro as populações adultas dessa espécie têm exigido doses ainda maiores, sem sucesso no controle (Correia & Durigan, 2009 Entre a última semana do mês de setembro e a primeira de outubro de 2008, as sementes de capim-amargoso foram coletadas em Cada unidade experimental foi constituída por um vaso plástico com capacidade para oito litros, preenchido com a mistura de terra, areia e esterco, na proporção de 3:1:0,5, respectivamente. O solo de textura argilosa foi coletado na camada de 0-20 cm do perfil do solo e peneirado em malha de 5 mm.…”

Section: Introductionunclassified

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Resposta de diferentes populações de Digitaria insularis ao herbicida glyphosate

2010

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RESUMO -Objetivou-se com estse trabalho avaliar o controle químico de diferentes populações de capim-amargoso (Digitaria insularis) pelo herbicida glyphosate por meio de curva de dose-resposta, além de propor tratamentos alternativos para as populações mais tolerantes. O delineamento experimental foi o de blocos ao acaso, com quatro repetições, em esquema fatorial 5 x 9. As sementes de capim-amargoso foram coletadas em cinco locais: área de produção de grãos da Fazenda de Ensino, Pesquisa e Produção da UNESP, Jaboticabal (SP); área de produção comercial de grãos, localizada nos municípios de Campo Florido-MG e Rio Verde-GO; pomar de laranja, localizado no município de Matão (SP); e área não agrícola sem histórico da aplicação de glyphosate (Jaboticabal-SP). O glyphosate (0D, 1/4D, 1/2D, D, 2D, 4D e 8D, em que D é a dose recomendada de 1,5 kg ha -1 de equivalente ácido) e as suas associações [glyphosate + fluazifop-p-butil (1,5 + 0,25 kg ha -1 ) e glyphosate (1,5 kg ha -1 ) com sequencial de diuron + paraquat (0,20 + 0,40 kg ha -1 + 0,2% de surfatante)] foram pulverizados em plantas de sete a oito perfilhos e altura média de 20 cm. As populações de capim-amargoso de Campo Florido e Rio Verde foram consideradas suscetíveis; as de Jaboticabal e Matão, tolerantes; e a da área não agrícola, de sensibilidade intermediária. A associação de glyphosate ao fluazifop ou a sua aplicação com sequencial de diuron + paraquat foram eficazes no controle das populações mais tolerantes de capim-amargoso.Palavras-chave: capim-amargoso, controle químico, dessecação, tolerância.ABSTRACT -The objective of this study was to evaluate the chemical control of different sourgrass (Digitaria insularis) populations by the herbicide glyphosate through dose-response curves, besides considering alternative treatments to control tolerant populations. A randomized block design was used with four replications, in a factorial scheme (5 x 9). Sourgrass seeds were colleted from five locations: a grain production area located at the educational, research and production farm of UNESP, Jaboticabal-SP; a grain production area located in the agricultural area of Campo Florido, MG, and Rio Verde, GO; citrus production area located in the agricultural area of Matão, SP, and an area without previous glyphosate application (Jaboticabal-SP). Glyphosate (0D, 1/4D, 1/2D, D, 2D, 4D and 8D, where D is the recommended rate of 1.5 kg ha -1 of acid equivalent) and its associations [glyphosate plus fluazifop-p-butyl (1.5 plus 0.25 kg ha -1 ) and glyphosate (1.5 kg ha -1 ) in sequence with diuron plus paraquat (0.20 plus 0.40 kg ha -1 plus 0.2% of surfactant)] were sprayed on the 7-8 tiller plants with average height of 20 cm. Campo Florido, MG and Rio Verde, GO sourgrass populations were considered susceptible; those of Jaboticabal-SP and Matão,SP were found to be tolerant and those from the nonagricultural area were considered of intermediate sensitivity. The association of glyphosate with fluazifop, or its application in sequence with diuron plus paraquat, were effi...

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Section: Resultsunclassified

Section: Introductionunclassified

Resposta de diferentes populações de Digitaria insularis ao herbicida glyphosate

2010

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“…However, for the treatments of glyphosate in association to quizalofop there was no relevant difference among the populations of D. insularis. Previous work has also shown synergy of ACCase inhibiting herbicides (aryloxyphenoxypropionate and cyclohexanediones chemical group) mixed with glyphosate to control resistant biotypes of D. insularis (Correia & Durigan, 2009;Melo et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…However, in some agricultural areas of South-Central Brazil, adult populations of this species have required even larger dosages without success in controlling (Correia & Durigan, 2009 (Carvalho et al, 2011). …”

Section: Introductionmentioning

confidence: 99%

Chemical control of different Digitaria insularis populations and management of a glyphosate-resistant population

2015

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-This study aimed to control different populations of Digitaria insularis by glyphosate herbicide, isolated and mixed, besides the combination of methods (chemical and mechanical) to manage resistant adult plants. Three experiments were conducted, one in pots which were maintained under non-controlled conditions and two under field conditions. In the experiment in pots, twelve populations of D. insularis were sprayed with isolated glyphosate (1. 44

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“…In some agricultural areas of Central Southern Brazil, adult populations of this species have required very high rates of glyphosate, with unsuccessful control (Correia and Durigan, 2009). As an alternative for management, ACCase inhibitors are currently used (chemical group aryloxyphenoxypropionate and cyclohexadienes), mixed with glyphosate for control of resistant D. insularis populations.…”

Section: Resultsmentioning

confidence: 99%

Chemical Control and Morphoanatomical Analysis of Leaves of Different Populations of Sourgrass

et al. 2017

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-Digitaria insularis has been selected by frequent glyphosate applications both in no-till areas and in fruit orchards. The objective of this paper was to evaluate control efficacy of D. insularis populations by glyphosate, alone and mixed with quizalofop-p-tefuryl, as well as classify them for herbicide sensitivity as susceptible, moderately susceptible and tolerant. This study also aimed to evaluate the relations between herbicide sensitivity and morphoanatomic features of leaf tissues. For chemical control, the experiment was conducted in a completely randomized design, with a 12 x 4 factorial arrangement with four replications. Twelve populations of D. insularis were treated with glyphosate alone at two concentrations (1.44 and 2.16 kg a.e. ha -1 ) and with the mixture of glyphosate (2.16 kg a.e. ha -1 ) and quizalofop-p-tefuryl (0.12 kg a.i. ha -1 ). One treatment without herbicide application was maintained for each plant population. Evaluations about the morphoanatomic features and wax content of leaves from the twelve plant populations were made under laboratory conditions. Populations 3, 5, 6 and 8 were considered to be susceptible; 9, 10 and 12 were considered as moderately susceptible; 1, 2, 4, 7 and 11 were considered tolerant to glyphosate. However, populations within each group (susceptible, moderately susceptible and tolerant) did not have similar characteristics that justify their response to glyphosate. Differences relative to herbicide translocation and/or plant physiology could account for the chemical control results for these populations.Keywords: Digitaria insularis, glyphosate, tolerance, genetic variability. RESUMO -A espécie

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Manejo químico de plantas adultas de Digitaria insularis com glyphosate isolado e em mistura com chlorimuronethyl ou quizalofop-p-tefuril em área de plantio direto

Cited by 18 publications

References 4 publications

Resposta de diferentes populações de Digitaria insularis ao herbicida glyphosate

Resposta de diferentes populações de Digitaria insularis ao herbicida glyphosate

Chemical control of different Digitaria insularis populations and management of a glyphosate-resistant population

Chemical Control and Morphoanatomical Analysis of Leaves of Different Populations of Sourgrass

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