Resposta de biótipos de Euphorbia heterophylla a doses de glyphosate

Várgas, Leandro; Nohatto, Marcos André; Agostinetto, Dirceu; Bianchi, Mário Antônio; Gonçalves, Eduardo Mendes; Toledo, Roberto

doi:10.1590/s0100-83582011000500020

Cited by 11 publications

(19 citation statements)

References 10 publications

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“…In glyphosate-tolerant biotypes of E. heterophylla, the dose of 720 g a.i. ha -1 was sufficient to cause plant death (Vargas et al, 2011).…”

Section: Resultsmentioning

confidence: 98%

“…The results of this study were similar to those observed by applying glyphosate at the same dose tested (2,160 g a.i. ha -1 ) on biotypes of Euphorbia heterophylla with suspected herbicide resistance, from RR ® soybean fields in the state of Rio Grande do Sul (Vargas et al 2011). For biotypes of Digitaria spp.…”

Section: Resultsmentioning

confidence: 99%

“…Management practices such as use of reduced rates of glyphosate, intensive use of the herbicide and lack of crop rotation have been suggested as causes of control failures of E. heterophylla by this herbicide in Rio Grande do Sul (Vargas et al, 2011). These may also be the reasons for such failure with Goosegrass.…”

Section: Resultsmentioning

confidence: 99%

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Low level resistance of goosegrass (Eleusine indica) to glyphosate in Rio Grande do Sul-Brazil

Várgas¹,

Ulguim

Agostinetto³

et al. 2013

Planta daninha

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In the last growing seasons, goosegrass (Eleusine spp.) control failures have been observed following application of glyphosate on Roundup Ready® soybean in Rio Grande do Sul (RS) - Brazil, suggesting this species' resistance to the herbicide. Thus, the objectives of this study were to identify the occurrence of goosegrass resistance to the herbicide glyphosate in RS; and to determine the predominant species of the genus Eleusine, as well as the LD50 and GR50 of the suspected resistant biotypes. Two experiments were conducted under greenhouse conditions: one to identify the biotypes resistant to glyphosate, and the other, a dose-response curve experiment, as well as a study of the botanical characteristics of the species. In the first experiment, 39 biotypes were tested, mainly Eleusine indica, collected with suspected resistance to glyphosate. The glyphosate dose was 2,160 g e.a. ha-1, and the control was evaluated at 28 days after treatment. All biotypes were effectively controlled,with the biotypes from the municipality of Boa Vista do Incra showing greater tolerance. Two biotypes suspected of resistance (12.1 and 12.3) and a susceptible biotype in a dose-response experiment were tested at the following doses: 0, 135, 270, 540, 1,080, 1,620, and 2,160 g e.a. ha-1. The results of this experiment showed that biotype 12.1 does not present resistance to glyphosate and biotype 12.3 has a low level resistance since it is effectively controlled by the herbicide at the maximum dose.

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“…In glyphosate-tolerant biotypes of E. heterophylla, the dose of 720 g a.i. ha -1 was sufficient to cause plant death (Vargas et al, 2011).…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Low level resistance of goosegrass (Eleusine indica) to glyphosate in Rio Grande do Sul-Brazil

Várgas¹,

Ulguim

Agostinetto³

et al. 2013

Planta daninha

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“…The genetic characteristics between species can influence their response to herbicides (Vargas et al, 2011). The insensitivity of weeds to herbicides may result from the difficulty of absorption of the product, due to characteristics of the leaf blade, such as roughness, hairiness and chemical composition of the epicuticular wax (Sanchotene et al, 2008).…”

Section: Differencesmentioning

confidence: 99%

Differential susceptibility of biotypes of conyza sumatrensis to Chlorimuron-ethyl herbicide

et al. 2014

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-Horseweed (Conyza spp.) is an annual weed, infesting soybean crops in southern Brazil, with chlorimuron-ethyl being one of the most commonly used herbicides for its control. However, in recent soybean harvests, an unsatisfactory control of this weed using this herbicide was observed, generating suspicion regarding the selection of resistant biotypes. The objective of this study was to evaluate the susceptibility of horseweed biotypes to the herbicide chlorimuron-ethyl. Two experiments were conducted in a greenhouse; in the first one, the biotypes were selected selected, and the second experiment was arranged in a 5 x 5 factorial in a completely randomized design with four replications. The treatments used in the preparation of the dose response curves were doses of the herbicide chlorimuron-ethyl (0.0, 1.56, 3.13, 6.25, 12.5, and 25 g ha -1 ), applied on the five horseweed biotypes at the 3-4 leaf growth stage. The variables evaluated were visual control percentage and shoot dry weight, compared to the control without herbicide application, and plant acetolactate accumulation. It was concluded that there is a differential susceptibility among the biotypes at doses of less than 20 g ha -1 (dose response curves), which indicates low-level resistance. The practical consequences are the indications of chlorimuron-ethyl application at the maximum doses recomended and that the practice of rotating mechanisms of action must be used in the chemical weed management of these areas.Keywords: chemical control, horseweed, low level resistance, ALS. chlorimuron-ethyl (0,0, 1,56, 3,13, 6,25, 12,5 RESUMO -A buva (Conyza spp.) é uma planta daninha anual que infesta lavouras de soja na região

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“…Studies in Brazil have shown resistance of the species to herbicides that inhibit acetolactate synthase (ALS) (VIDAL; MEROTTO JUNIOR., 1999) and protoporphyrinogen oxidase (PROTOX) (TREZZI et al, 2005) and that have a low level resistance to glyphosate (VARGAS et al, 2011). Herbicide resistance can interfere with the competitiveness of weeds (OLIVEIRA et al, 2014); therefore, this is an important issue for the maintenance of crop yields.…”

Section: Introductionmentioning

confidence: 99%

Does competition between soybeans and Wild Poinsettia with low-level resistance or susceptibility to glyphosate affect physiology and secondary metabolism?

Ulguim

Agostinetto

Oliveira

et al. 2017

SCA

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The Wild Poinsettia (Euphorbia heterophylla L.) has elevated potential to reduce the soybean yield and is a difficult to control plant due to herbicide resistance. The objectives of this study were to determine the changes in the photosynthetic physiological parameters, secondary metabolite levels, cellular damage, and antioxidant system activity in soybean plants and Wild Poinsettia biotypes with a low level of resistance or susceptibility to glyphosate in competition with soybeans. Two replacement series experiments were conducted in a greenhouse under competition between soybeans and the low-level resistant biotype (experiment I) or susceptible biotype (experiment II). The treatments consisted of different proportions of soybean plants and Wild Poinsettia [100:0 (pure stand of soybean), 50:50, and 0:100 (pure stand of Wild Poinsettia)] and different evaluation periods (the 2013/14 and 2014/15 growing seasons). The following parameters were analyzed: the chlorophyll, carotenoid (CRT), total phenol, hydrogen peroxide (H 2 O 2 ), and lipid peroxidation levels and the catalase (CAT), ascorbate peroxidase (APX), and superoxide dismutase (SOD) enzyme activity. Generally, competition between the soybeans and the Wild Poinsettia biotypes did not alter the photosynthetic parameters or the photosynthetic pigment levels of the crop. For the weed biotypes, competition with the soybeans negatively affected photosynthesis. Greater losses of chlorophylls and CRTs were observed for the susceptible biotype when in competition with soybeans, whereas the opposite trend was observed for the biotype with a low level of resistance. No cellular damage or alterations in antioxidant system enzyme activity was observed, which indicated a lack of oxidative stress. Key words: Photosynthesis. Stomatal conductance. Chlorophyll. Carotenoids. Euphorbia heterophylla L. ResumoA leiteira (Euphorbia heterophylla L.) apresenta elevado potencial de redução da produtividade de soja, sendo uma planta de difícil controle devido aos casos de resistência a herbicidas. Os objetivos desse trabalho foram determinar a alteração nos parâmetros fisiológicos fotossintéticos, o conteúdo de metabólitos secundários, os danos celulares e a atividade do sistema antioxidante em soja e em biótipo de leiteira resistente de nível baixo ou suscetível ao glyphosate, quando em competição com a soja. Foram realizados dois experimentos em casa de vegetação, em série de substituição, com a competição de soja com o biótipo resistente de nível baixo (experimento I) ou suscetível (experimento II). Os tratamentos constaram das proporções de plantas de soja e leiteira 100:0 (estande puro de soja), 50:50, e 0:100% (estande puro de leiteira); e, das diferentes épocas de condução dos experimentos (safras 2013/14 e 2014/15). Foram analisados o teor de clorofila e carotenoides, fenóis totais, peróxido de hidrogênio, peroxidação lipídica e atividade das enzimas catalase, ascorbato peroxidase e superóxido dismutase. A competição de soja com os biótipos de leiteira, em geral, n...

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Resposta de biótipos de Euphorbia heterophylla a doses de glyphosate

Cited by 11 publications

References 10 publications

Low level resistance of goosegrass (Eleusine indica) to glyphosate in Rio Grande do Sul-Brazil

Low level resistance of goosegrass (Eleusine indica) to glyphosate in Rio Grande do Sul-Brazil

Differential susceptibility of biotypes of conyza sumatrensis to Chlorimuron-ethyl herbicide

Does competition between soybeans and Wild Poinsettia with low-level resistance or susceptibility to glyphosate affect physiology and secondary metabolism?

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