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

Correia, Núbia Maria; Acra, L. T.; Balieiro, Geraldo

doi:10.1590/s0100-83582015000100011

Cited by 18 publications

(23 citation statements)

References 12 publications

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“…In Italian ryegrass plants, the adaxial surface was less wettable and retained less fluid high physiological and leaf maturity (Correia et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Does Sourgrass leaf anatomy influence glyphosate resistance?

Barroso¹,

Galeano²,

Albrecht³

et al. 2015

Com. Sci.

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Sourgrass(Digitaria insularis, L. Mez ex Ekman)is a weed that requires high rates of glyphosate ((N-[phosphonomethyl]-glycine) forcontrol, verylittle of the herbicide applied isabsorbed by theleaves. Morphological and histological differences in leaves of glyphosate-resistant and glyphosate-susceptible plantsshould explain the contrast of variance between herbicide susceptibility. Leaves of different growth andphenological stages were collected and submitted to histological andelectron microscopy scanning analysis. Those plants were also submitted to a glyphosate dose-response curve analysis. The results suggest thatbiotypes exhibits differences infoliar structures that can influence the uptake and translocation of glyphosate. A thinparenchyma, lesser distance amongvascular bundles, and higher phloem sizewere found in resistant biotypes (differences close to 10%). Minor stomata number and higher epicuticular waxy deposition in stomata and leaf surface were found in resistant plants when leaves came from regrowth, leading to a possiblelesser herbicide absorption. Resistant plants showed absence of trichomes in late stages of development (64% less trichomes than susceptible plants). The higher concentration of trichomes in susceptible plants can be an absorption pathfor glyphosate getthrough the cuticle.Keywords: Absorption, herbicide resistance, parenchyma,trichomes A anatomia foliar de capim-amargoso influencia na resistência ao glyphosate? ResumoO capim-amargoso (Digitaria insularis, L. Mez ex Ekman) é uma plantadaninha que requer altas dosesde glifosato ((N-[fosfonometilo] glicina) para seu controle, sendo pouco do herbicida aplicado absorvido pelas folhas. Diferenças morfológicas e histológicas em folhas de biótipos resistentes e suscetíveis ao glifosato podem explicar a susceptibilidade diferencial ao herbicida. Folhas de diferentes estádios de crescimento de plantas foram coletadas e submetidas à análise histológica e de microscopia eletrônica de varredura. Essas plantas foram também submetidas a uma curva de dose-resposta ao glifosato. Os resultados sugerem diferenças foliares que podem influenciar a absorção e translocação de glyphosate. Um parênquima menos espesso, menores distâncias entre feixes vasculares, e maior tamanho de floema no biótipo resistente em relação ao biótipo suscetível foram observados (diferenças próximo a 10%). Menor número de estômatos e maior deposição de cera epicuticular em estômatos e superfície foliar nos biótipos resistentes foram encontradas quando a folha veio do rebrote, levando a uma possível menor absorção do herbicida. Em biótipos resistentes encontrou-se aausência de tricomas nos últimos estágios do desenvolvimento (64% a menos do que os tricomas plantas suscetíveis). A maior concentração de tricomas em plantas sensíveis, podem ser uma via de absorção para o glyphosate por entre a cutícula. Palavras-chave:Resistência a herbicidas, absorção, tricomas, parênquima

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“…In Italian ryegrass plants, the adaxial surface was less wettable and retained less fluid high physiological and leaf maturity (Correia et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Does Sourgrass leaf anatomy influence glyphosate resistance?

Barroso¹,

Galeano²,

Albrecht³

et al. 2015

Com. Sci.

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“…Contudo, diversos autores (Adegas et al, 2010;Barroso et al, 2014;Correia et al, 2015), ao empregarem os herbicidas clethodim, fluazifop-pbuthyl, fenoxaprop-p-ethyl, tepraloxydim, clethodim + + fenoxaprop-p-ethyl, paraquat, haloxyzafop-methyl ou imazapyr, em plantas desta mesma espécie com até dois perfilhos, observaram níveis de controle superiores a 90%. Porém, segundo Procópio et al (2006a), quando a planta cresce e rebrota, esse controle cai para aproximadamente 50%, o que demonstra a dificuldade no controle de plantas perenizadas.…”

Section: Alternativas No Manejo De Digitaria Insularis Resistente Ao unclassified

“…Porém, segundo Procópio et al (2006a), quando a planta cresce e rebrota, esse controle cai para aproximadamente 50%, o que demonstra a dificuldade no controle de plantas perenizadas. Correia et al (2015) conseguiram um controle eficiente somente em plantas adultas de capim-amargoso com aplicações sequenciais quinzenais de glyphosate associado a quizalofop-ptefuril ou clethodim, com controle acima de 80% nestas plantas e no rebrote. Assim, o manejo de rebrote de capim-amargoso no plantio direto de milho, em aplicação de glyphosate + 2,4-D amina, 20 dias antes do plantio do milho, seguido de nicosulfuron,aos 25 dias após a semeadura da cultura, suprimiu o rebrote em até 30 dias após a aplicação e permitiu o desenvolvimento da cultura (Timossi, 2009).…”

Section: Alternativas No Manejo De Digitaria Insularis Resistente Ao unclassified

Características biológicas de Digitaria insularis que conferem sua resistência à herbicidas e opções de manejo

Gazola¹,

Belapart²,

Castro³

et al. 2016

Científica

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ResumoDigitaria insularis é uma planta daninha altamente disseminada no Brasil. Trata-se de uma gramínea perene que possui alta capacidade de infestação por possuir pequenas sementes com grande poder germinativo e de dispersão. Além disso, essa planta daninha, uma vez perenizada, forma touceiras e pode reproduzir-se através de seus rizomas, caracterizando este estádio fenológico como de difícil controle. Com a confirmação de biótipos resistentes ao herbicida glyphosate, essa espécie tem-se tornado um grande problema para a agricultura, uma vez que inibidores da EPSPS são os únicos herbicidas capazes de controlar essas espécies sem restrições quanto ao estádio fenológico. Fica evidente que o controle eficaz do capim-amargoso não se restringe a um único herbicida, bem como a uma única aplicação. Seu monitoramento deve ser constante, haja vista que se trata de uma planta daninha perene, altamente adaptada às condições brasileiras, com alto poder de infestação e que gera grandes prejuízos para a agricultura, reduzindo a produção e aumentando os custos com insumos. Esta revisão bibliográfica teve por objetivo compilar informações disponíveis na literatura, de modo que auxilie pesquisadores e profissionais das ciências agrárias nas tomadas de decisões e no manejo racional desta planta daninha.Palavras-chave adicionais: capim-amargoso; controle químico; glyphosate; plantas daninhas. AbstractDigitaria insularis is a highly pervasive weed in Brazil, it is a perennial grass that has high capacity infestation has small seeds with great power germination and dispersion moreover, this weed once perenizada, form clumps and can play through their rhizomes featuring this phenological stage as difficult to control. With the confirmation biotypes resistant to glyphosate, this species has become a major problem for agriculture, since, EPSPS inhibitors are the only herbicides capable of controlling these species no restrictions on the growth stage. It is evident that the effective control of sourgrass is not restricted to a single herbicide, as well as a single application, its monitoring should be constant, given that it is a perennial weed, highly adapted to Brazilian conditions, with high power of infestation and that causes extensive damage to agriculture, reducing production and increasing input costs. This literature review aim to compile information available in the literature, so that assist researchers and professionals in agricultural sciences in decision making and rational management of this weed.

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“…ha -1 ) with quizalofop-p-tefuryl (0.12 kg a.i. ha -1 ), Correia et al (2015) found that population 11 (grain production area in Itumbiara-GO) was sensitive to glyphosate alone; populations 5 (citrus orchard in Colômbia-SP) and 9 (area with sugarcane crops in Pradópolis-SP) were moderately susceptible; and populations 1, 2, 3 and 4 (grain production area in Jaboticabal-SP), 6, 7 and 8 (citrus orchard in Bebedouro, SP, Ibitinga-SP and Balbinos-SP), 10 (rubber tree area in Bebedouro, SP) and 12 (urban area in Jaboticabal-SP) were tolerant, in the light of biotype sensitivity to increased rates of glyphosate alone.…”

Section: Introductionmentioning

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

Cited by 18 publications

References 12 publications

Does Sourgrass leaf anatomy influence glyphosate resistance?

Does Sourgrass leaf anatomy influence glyphosate resistance?

Características biológicas de Digitaria insularis que conferem sua resistência à herbicidas e opções de manejo

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

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