Susceptibilidade diferencial ao herbicida glyphosate e capacidade de rebrota de populações de capim-amargoso

Canedo, Isadora Fernandes; Araújo, Lucas da Silva; Silva, Luis Gustavo Barroso; Valente, Mateus de Souza; Freitas, M.A.M.; Cunha, Paulo César Ribeiro da

doi:10.1590/0034-737x201966010003

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…Other 16 populations were considered resistant, with C50 or GR50 always above 1,000 g ha -1 of glyphosate (Tables 3 and 4). These values are in accordance with scientific literature in which C50 or GR50 of susceptible populations are usually found between 150 and 700 g ha -1 of glyphosate (CORREIA et al 2010, GONÇALVES NETTO et al 2015, ANDRADE et al 2019, CANEDO et al 2019). With 16 resistant biotypes, means of C50 and GR50 might also be generated (1605.05 and 1504.98 g ha -1 ), which allowed the calculation of F (factor of resistant).…”

Section: Dose-response Curves For 30 Initial Populations Of Sourgrasssupporting

confidence: 91%

Monitoring and baseline of glyphosate-resistant sourgrass in the main soybean growing regions of Brazil

Netto

Carvalho

Nicolai

et al. 2022

Rev. Ciênc. Agrovet.

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Frequent application of glyphosate for consecutive years has enhanced the selection pressure on sourgrass (Digitaria insularis) populations, which resulted in the development of glyphosate-resistant biotypes. Therefore, this work was developed with the objective of monitoring sourgrass resistance to glyphosate, develop a baseline of sourgrass susceptibility to this molecule and, consequently, identify the discriminatory dose between resistant and susceptible populations. This work was divided into three steps. The first step consisted of identifying and sorting sourgrass resistant and susceptible biotypes among 30 samples. In the second step, glyphosate baseline was elaborated considering exclusively the glyphosate-susceptible biotypes, which allowed the definition of a discriminatory dose. At the end, the third step, monitoring of glyphosate-resistant biotypes was achieved, considering five growing seasons (2016 – 2020) and 809 samples of sourgrass populations, collected throughout 12 states of Brazil. Glyphosate baseline was elaborated to sourgrass and ideal discriminatory rate was identified as 960 g ha-1. Glyphosate-resistant populations of sourgrass were found in all soybean growing regions sampled. Among 809 populations, 25.96% were considered resistant to glyphosate. The states with the highest frequency of glyphosate-resistant populations were Rio Grande do Sul, Mato Grosso do Sul, Bahia, Mato Grosso and Paraná.

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Section: Dose-response Curves For 30 Initial Populations Of Sourgrasssupporting

confidence: 91%

Monitoring and baseline of glyphosate-resistant sourgrass in the main soybean growing regions of Brazil

Netto

Carvalho

Nicolai

et al. 2022

Rev. Ciênc. Agrovet.

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“…A menor matéria seca, referente a menor concentração de água e consequente vida celular da planta, mostra que o efeito do herbicida haloxifop-P-metílico foi mais efetivo no controle de D. insularis L. (CANEDO et al, 2019). Barroso et al (2010), afirmam que o efeito sinérgico dos adjuvantes é dependente da espécie da planta alvo e do herbicida utilizado.…”

Section: Resultsunclassified

EFEITO DE ADJUVANTE ASSOCIADO A HERBICIDAS NO CONTROLE DE Digitaria insularis L.

Caixeta¹,

Júnior²,

Brigante³

et al. 2020

RBHerbicidas

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A aplicação de herbicidas com adjuvantes pode melhorar a eficiência de controlede plantas daninhas como a Digitaria insularis L., que ocasiona prejuízos emdiversas culturas agrícolas devido a sua alta competitividade e dificuldade decontrole. Assim, este estudo teve como objetivo avaliar o sinergismo do adjuvanteSinerMax® associado aos herbicidas cletodim, glifosato e haloxifop-P-metílico nocontrole do capim-amargoso (Digitaria insularis L). O experimento foi conduzidoentre setembro e outubro de 2018. O delineamento experimental utilizado foi o emblocos casualizados em esquema fatorial 3x2+1 com 5 repetições, sendo ostratamentos com cletodim 240 g L-1 de i.a. (0,45 l ha-1), glifosato 480 g L-1 de i.a.(4 L ha-1) e haloxifop-P-metílico 124,7 g L-1 de i.a. (0,5 L ha-1) associados ou nãoao adjuvante SinerMax® (0,5 L ha-1) e o tratamento controle sem uso de herbicida,sendo avaliado a ausência de dano aparente, a morte completa da planta e matériaseca das plantas. Os dados obtidos foram submetidos a análise de variância e asmédias comparadas pelo teste de Scott-Knott à 5% probabilidade. Os herbicidashaloxifop-P-metílico e glifosato apresentam os melhores níveis de controle deDigitaria insularis L., com maior fitotoxidade (entre 60 e 90%) e menor acúmulode matéria seca em relação ao tratamento controle. O adjuvante (SinerMax®)associado aos herbicidas glifosato, haloxifop-P-metílico e cletodim não resultouem maior eficiência de controle de D. insularis L.

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“…In addition to resistance cases, as a perennial grass D. insularis is hard to control, especially during flowering development (Zobiole et al, 2016;Canedo et al, 2019). A study by Gazziero et al (2019) shows that a cohabitation of six D. insularis plants m -2 among soybean crops reduces its yield by 40%.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of imazapic/imazapyr and other herbicides in mixtures for the control of Digitaria insularis prior to soybean sowing

Albrecht

Silva

et al. 2020

Agron. Colomb.

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Herbicide mixtures, use of multiple sites of action, and other weed management practices are necessary to avoid cases of biotype resistance. The aim of this study was to evaluate the efficiency of imazapic/imazapyr and other herbicides in mixtures to control Digitaria insularis at burndown before soybean sowing. This field research was conducted in Umuarama, State of Parana (PR), Brazil, in the 2018/19 soybean season. The experiment was conducted in a randomized block experimental design with four replications and 11 treatments composed of the application of glyphosate, clethodim, haloxyfop, imazapic/imazapyr, glufosinate, 2,4-dichlorophenoxyacetic acid (2,4-D), dicamba, triclopyr, and saflufenacil, in mixtures. Weed control was evaluated as well as soybean injury and yield. An analysis of variance and F-test were performed, and the treatment means were compared by the Scott-Knott test. All treatments showed great control over the weed and low crop injury rate while maintaining soybean yield. The application of imazapic/imazapyr in mixtures with other herbicides was effective in controlling glyphosate-resistant D. insularis in burndown before soybean sowing and with sequential application of haloxyfop + glyphosate at V3 stage of soybean. This chemical management was also selective for soybean.

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Susceptibilidade diferencial ao herbicida glyphosate e capacidade de rebrota de populações de capim-amargoso

Cited by 5 publications

References 17 publications

Monitoring and baseline of glyphosate-resistant sourgrass in the main soybean growing regions of Brazil

Monitoring and baseline of glyphosate-resistant sourgrass in the main soybean growing regions of Brazil

EFEITO DE ADJUVANTE ASSOCIADO A HERBICIDAS NO CONTROLE DE Digitaria insularis L.

Efficacy of imazapic/imazapyr and other herbicides in mixtures for the control of Digitaria insularis prior to soybean sowing

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