Goosegrass Resistant to Glyphosate in Brazil

Takano, Hudson Kagueyama; Oliveira, Rubem Silvério de; Constantin, Jamil; Braz, Guilherme Braga Pereira; Gheno, Eliezer Antonio

doi:10.1590/s0100-83582017350100013

Cited by 35 publications

(48 citation statements)

References 26 publications

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“…Biotypes that have glyphosate resistance have been selected in crops such as corn, soybeans, and various orchards. In Brazil, glyphosate-resistant biotypes of Conyza bonariensis [31], Conyza canadensis [32,33], Conyza sumatrensis [34], Lolium multiflorum [35,36], Digitaria insularis [9,37], Chloris elata [38], Eleusine indica [39], Amaranthus palmeri [40], and more recently Amaranthus hybridus [41] and Euphorbia heterophylla [42] were identified.…”

Section: Glyphosate-resistant Weeds In Brazilmentioning

confidence: 99%

Current Approaches to Pesticide Use and Glyphosate-Resistant Weeds in Brazilian Agriculture

Mendes¹,

Sousa²,

Laube³

2020

Multifunctionality and Impacts of Organic and Conventional Agriculture

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The aim of this chapter is to show a general vision about the pesticides use in Brazil. Pesticides are chemical products that contribute to agricultural production processes, mainly large scale, as agents of chemical, physical and biological processes. The glyphosate is the most widely used pesticide in Brazil to vast area cultivated with genetically modified glyphosate-resistant crops. Also, this herbicide is the most widely used in the world to control weeds in various crops, making chemical control cheap, easy and efficient. However, with the advance in the cultivation of glyphosate-resistant crops and the intensive use of this herbicide associated with the non-use of other herbicides, glyphosate-resistant weed biotypes are emerging very quickly. In this way, its use must be performed consciously in order not to occur significant increase in the amount of weeds resistant to this herbicide. Despite its great use in the country, it presents few records of resistant weeds when compared to other herbicide action mechanisms. Thus, good agricultural practices are indispensable and more innovations in technologies are necessary for the future. Therefore, adopting a long-term weed management perspective and integration systems for all agricultural practices is of paramount importance to farmers.

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Section: Glyphosate-resistant Weeds In Brazilmentioning

confidence: 99%

Current Approaches to Pesticide Use and Glyphosate-Resistant Weeds in Brazilian Agriculture

Mendes¹,

Sousa²,

Laube³

2020

Multifunctionality and Impacts of Organic and Conventional Agriculture

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“…In this way, a decision was made to use the mathematical calculation through the inverse equation of Streibig 4 (1988), hence C 50 could be calculated according to the proposition of Souza et al (2000). The models used to obtain C 50 were the same ones used in other recent reports cited in the literature (Takano et al, 2016(Takano et al, , 2017.…”

Section: Second Experimentsmentioning

confidence: 99%

Paraquat Resistance of Sumatran Fleabane (Conyza sumatrensis)

et al. 2019

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In Brazil, some populations of Conyza bonariensis and C. canadensis are glyphosate resistant and there are populations of C. sumatrensis (Sumatran fleabane) presenting multiple resistance to both glyphosate and chlorimuron. During the 2014/2015 and 2015/2016 seasons, growers reported failures to control Sumatran fleabane with paraquat. This study investigated the potential of paraquat resistant Sumatran fleabane populations in Paraná state, Brazil. Populations with suspected paraquat resistance were tested in the field in 2016 season. In 2017, seeds from these populations were collected, sown and grown in a greenhouse. Paraquat doseresponse curve experiments were performed in Mogi Mirim, SP; Londrina, PR and Palotina, PR using doses of 0, 50, 100, 200, 400, 800, 1,600 and 3,200 g ha -1 , following all standard criteria for confirmation of weed resistance cases. Percentage control was assessed at 3, 7, 14, 21 and 28 days after application and data were fitted to a nonlinear, log-logistic model, and dose response curves were generated. The results of this study confirmed significant levels of resistance of Sumatran fleabane biotypes to paraquat with resistance factors between 3,57 to 34,29. Therefore, the first case of C. sumatrensis resistance to paraquat was confirmed in biotypes from the western area of Paraná state, Brazil.Keywords: control, dose-response, PSI inhibitor. RESUMO -No Brasil,Conyza bonariensis e C. canadensis apresentam biótipos resistentes a glyphosate e C. sumatrensis apresenta resistência múltipla a glyphosate e chlorimuron. Durante as safras de 2014/2015 e 2015/2016 foram relatadas falhas no controle de buva submetida à aplicação de paraquat. Este estudo teve por objetivo investigar a possibilidade da resistência ao paraquat em populações de C. sumatrensis. Populações com suspeita de resistência foram testadas em campo na entressafra de 2016, sendo depois coletadas sementes e plantas durante a safra de 2017, que foram posteriormente, estudadas em casa de vegetação. Experimentos com curva de dose-resposta foram instalados em SP, utilizando doses de 0, 50, 100, 200, 400, 800, . Foi avaliada a porcentagem de controle aos 3, 7, 14, 21 e 28 dias após aplicação e utilizado um modelo não linear log-logístico para o ajuste da curva de doseresposta. Com os resultados obtidos neste estudo, foi confirmada a hipótese inicial do primeiro caso de resistência da buva ao paraquat na região oeste do Estado do Paraná, com fator de resistência variando entre 3,57 e 34,29, seguindo todos os critérios para a confirmação da resistência.Palavras-chave: controle, dose-resposta, inibidor do fotossistema I.

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“…Resistant species, such as ryegrass (Lolium multiflorum), horseweed (Conyza spp. ), sourgrass (Digitaria insularis), tall windmill grass (Chloris elata) and, more recently, goosegrass (Eleusine indica) (Takano et al, 2017) have been selected in Brazil. Therefore, the application of herbicides with different mechanisms of action has been necessary in order to prevent and manage this resistance.…”

Section: Introductionmentioning

confidence: 99%

Residual Activity of Sulfentrazone Applied to Soybean on Cotton Crop in Succession

et al. 2019

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Weed resistance to glyphosate in agricultural production systems has led to the need of applying herbicides with different mechanisms of action. However, the persistence of these herbicides in the soil can harm the subsequent crop. This study aimed to assess the effect of the residual activity of the herbicide sulfentrazone applied in pre-emergence of soybean on cotton in succession. The experimental design was a randomized block design with five replications, with seven doses of sulfentrazone (0, 37.5, 75, 150, 300, 600, and 1,200 g ha -1 ). Cotton was sown at 112 days after herbicide application (DAA), with an accumulated precipitation of 637 mm during soybean cycle. Variables related to photosynthetic characteristics, phytointoxication, establishment, development, production components, and yield were assessed in both crops. The residual activity of sulfentrazone did not significantly interfere with the assessed variables in soybean but caused significant losses to cotton, which the recommended dosage (600 g ha -1 ) of the herbicide reduced cotton yield by 30%.

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Goosegrass Resistant to Glyphosate in Brazil

Cited by 35 publications

References 26 publications

Current Approaches to Pesticide Use and Glyphosate-Resistant Weeds in Brazilian Agriculture

Current Approaches to Pesticide Use and Glyphosate-Resistant Weeds in Brazilian Agriculture

Paraquat Resistance of Sumatran Fleabane (Conyza sumatrensis)

Residual Activity of Sulfentrazone Applied to Soybean on Cotton Crop in Succession

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