Práticas de manejo e a resistência de Euphorbia heterophylla aos inibidores da ALS e tolerância ao glyphosate no Rio Grande do Sul

Várgas, Leandro; Nohatto,; Agostinetto, Dirceu; Bianchi,; Paula, Juliana Maria de; Polidoro, E.; Toledo, Roberto

doi:10.1590/s0100-83582013000200021

Cited by 20 publications

(15 citation statements)

References 6 publications

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“…Due to the use of glyphosate in desiccation and multiplication of C. bonariensis biotypes with herbicide resistance, this species has been highlighted in soybean areas cultivated with varieties resistant to this herbicide, which may be associated with its occurrence in the areas of the study. This reflects the need for changes in management and control practices to reduce the occurrence of this species (Vargas et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

<b>Phytosociology of weed in the southwestern Goiás region

et al. 2018

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ABSTRACT. Roundup Ready ® technology adoption and the cultivation of a second crop have changed chemical control methods and weed management in the southwest region of Goiás State, Brazil. Considering these changes, this study aimed to perform a phytosociological survey in areas with glyphosate resistant soybeans and conventional soybeans as the main harvest and sorghum, maize, millet or fallow in succession as the second harvest. A multivariate matrix of the floristic composition was constructed, and the indicator values of the individual number and dry biomass of species were measured. Based on the number of individuals, the species Chamaesyce hirta, Bidens subalternans, and Cissampelos ovolifolia were typical of areas cultivated with glyphosate-resistant soybean, while Euphorbia heterophyla presented indicator values of areas with conventional soybean cultivation. During the second harvest period, significant indicator values were observed for Crotalaria spectabilis in maize areas, Cenchrus echinatus in sorghum, and Commelina benghalensis, Sida glaziovii, Ipomoea grandifolia, Sida rhombifolia, and Ipomoea cordifolia in areas with millet. The species Conyza bonariensis was typical in the period before the herbicide application at post-emergence in harvest. Volunteer soybean presented as typical for the period before the herbicide application at postemergence in the second harvest. Weeds that were difficult to control or were tolerant and resistant to the herbicide applications were recorded in the areas studied.Keywords: soybean, second crop, crop succession, resistance, herbicide. Fitossociologia de plantas daninhas na região sudoeste de Goiás RESUMO.A adoção da tecnologia Roundup Ready ® e o cultivo de segunda safra alteraram os métodos de controle químico e o manejo das plantas daninhas na região sudoeste do Estado de Goiás, Brasil. Tendo em vista estas alterações, este estudo teve o objetivo de realizar um levantamento fitossociológico em áreas de soja resistente ao glyphosate e soja convencional na safra principal e sorgo, milho, milheto ou pousio em sucessão na segunda safra. Foi constituída uma matriz multivariada da composição florística e calculado o valor indicador do número de indivíduos e biomassa seca das espécies. Com base no número de indivíduos as espécies Chamaesyce hirta, Bidens subalternans e Cissampelos ovolifolia foram típicas de áreas de cultivo com soja resistente ao glyphosate, enquanto que Euphorbia heterophyla apresentou valor indicador para áreas de cultivo de soja convencional. Na safrinha, os valores indicadores significativos foram observados para: Crotalaria spectabilis, nas áreas de milho; Cenchrus echinatus no sorgo; e Commelina benghalensis, Sida glaziovii, Ipomoea grandifolia, Sida rhombifolia e Ipomoea cordifolia, nas áreas com milheto. A espécie Conyza bonariensis foi típica do período que antecede a aplicação de herbicidas em pós-emergência na safra. A soja voluntária apresentou-se como típica para o período que antecede a aplicação de herbicidas em pós-emergência na safri...

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Section: Resultsmentioning

confidence: 99%

<b>Phytosociology of weed in the southwestern Goiás region

et al. 2018

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“…Similar results were observed in biotypes sensitivity studies of Euphorbia heterophylla and Eleusine spp. with suspicion of resistance to the glyphosate herbicide, originated from soy crops RR from Rio Grande do Sul -RS (Ulguim, 2012;Vargas et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Geographic Distribution of Ryegrass Resistent to the Clethodim Herbicide in Rio Grande do Sul1

et al. 2016

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-Ryegrass is a weed of annual cycle that is present in winter crops, in orchards and vineyards of the South region of Brazil. The species is normally controlled by the glyphosate herbicide, but the continuous use of this product caused the selection of resistant biotypes. The use of ACCase inhibitor herbicides is the main alternative for the control of this species, but it has not been satisfactory in some places, thus causing suspicion of resistance to this action mechanism. Thus, the objective of this paper was to evaluate the occurrence and geographic distribution of ryegrass biotypes that are resistant to the clethodim herbicide in the state of Rio Grande do Sul. For that, seeds of ryegrass plants that survived the application of clethodim were collected in crops from the north region of RS, summing up to a total of 152 samples from 72 cities. The biotypes were submitted to the application of 120 g i.a. ha -1 (maximum registered dose) and 60 g i.a. ha -1 de clethodim (half the maximum registered dose). According to the results, among the samples of ryegrass seeds collected, there were no biotypes resistant to the clethodim herbicide when the maximum registered dose was applied and in the stage of three to four leaves. However, there were biotypes with lower susceptibility that survived half the maximum registered dose.

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“…The high distribution of E. heterophylla biotypes resistant to ALS-inhibiting herbicides used for weed control in conventional soybean crops may explain this result. According to Vargas et al (2013), the adoption of genetically modified soybean for resistance to glyphosate, represented an alternative to control E. heterophylla biotypes resistant to acetolactato synthase inhibitors.…”

Section: Resultsmentioning

confidence: 99%

Factors associated with weed occurrence in Southwest region of Gois

Santos¹,

ProcÃ3pio²,

Silva³

et al. 2016

Afr. J. Agric. Res.

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After the introduction of Roundup Ready® technology, there were changes in community composition of weeds in the Southwest of Goiás. In this sense, this study aimed at evaluating weed distribution in different cropping systems in this region. Thus, phytosociological survey was conducted in three different periods. Studies were conducted on thirty-five areas derived from combined soybean crops resistant to glyphosate and conventional soybean, maize, sorghum, millet or fallow in succession. The number of individuals of weeds, dry biomass of soil surface and edaphoclimatic data was obtained in order to describe the variables responses of floristic composition. The factors associated to the total occurrence of species were evaluated and five species difficult to control (Cenchrus echinatus, Alternanthera tenella, Chamaesyce hirta, Euphorbia heterophylla e Glycine max) in regression analysis on tree were selected. A total of 3,219 individuals among 79 species were recorded. Regarding total occurrence of species period desiccation of main crop pre-planting (44.80 pl. 5 m 2 ) and on sites that showed pH> 5,37 (51.20 pl. 5 m 2 ) had higher infestations. Voluntary soybean was found in off-season, preferably with high sand content. Species of hard control, tolerant or resistant to herbicides were diagnosed in areas study.

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Práticas de manejo e a resistência de Euphorbia heterophylla aos inibidores da ALS e tolerância ao glyphosate no Rio Grande do Sul

Cited by 20 publications

References 6 publications

<b>Phytosociology of weed in the southwestern Goiás region

<b>Phytosociology of weed in the southwestern Goiás region

Geographic Distribution of Ryegrass Resistent to the Clethodim Herbicide in Rio Grande do Sul1

Factors associated with weed occurrence in Southwest region of Gois

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