Teores de água no solo e eficácia do herbicida glyphosate no controle de Euphorbia heterophylla

Zanatta, Jocemar Francisco; Procópio, S.O.; Manica, R.; Pauletto, Eloy Antônio; Filho, Alberto Cargnelutti; Vargas, Luis Mario Tapia; Sganzerla, Daiane Cristina; Rosenthal, Mariane D’Avila; Pinto, J.J.O.

doi:10.1590/s0100-83582007000400017

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…ha -1 ) (Figure 1). This result corroborates the one found by a study of different wild poinsettia biotypes in which the same dose was enough to cause plant death (NOHATTO, 2010;VARGAS et al, 2011;ZANATTA et al, 2007).…”

Section: Resultssupporting

confidence: 91%

Low level resistance of wild poinsettia biotypes to glyphosate and alternative chemical control

et al. 2019

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In the State of Rio Grande do Sul (RS), Southern Brazil, glyphosate has not been capable of controlling wild poinsettia (Euphorbia heterophylla L.) in soybean fields, thus, suggesting resistance to this herbicide. Therefore, this study aimed at evaluating sensitivity of wild poinsettia biotypes to glyphosate, identifying the occurrence of resistance of wild poinsettia to the herbicide in RS state and determining the resistance factor of wild poinsettia biotypes under suspicion, besides assessing other herbicides as alternative controls. Two greenhouse experiments, which lasted two years, were conducted by a completely randomized design with four replications. Six biotypes (Factor A) and eight doses of glyphosate (Factor B) were used for getting the dose-response curve. Regarding the alternative control, post-emergence herbicides for soybean and corn crops were tested. Control and dry mass of the shoot were analyzed as variables. Resistance factors of resistant biotypes 20.2 and 21.1 were 4.83 and 5.29, respectively, by comparison with the susceptible biotype (11.4). In RS state, there has currently been high selection pressure due to the intensive use of glyphosate against wild poinsettia plants, as the result of the occurrence of biotypes 20.2 and 21.1 which have low levels of resistance to glyphosate and very little control by ALS-inhibiting herbicides. Therefore, an alternative to mitigate the problem is the use of herbicides with different mechanisms of action.

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Section: Resultssupporting

confidence: 91%

Low level resistance of wild poinsettia biotypes to glyphosate and alternative chemical control

et al. 2019

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“…In relation to soil moisture, glyphosate caused less reduction in fresh mass in I. grandifolia under water restriction (Figure 5). Similar results in various weed species were observed by Zanatta et al (2007) andSilva Jr. et al (2018). The reduction in efficiency occurs due to lower herbicide absorption and translocation due to morphophysiological changes (Vitorino and Martins 2012), such as thickening and composition of epicuticular wax, leaf pilosity, reduced water potential and modification of leaf orientation (Levene and Owen 1995;Vidal et al 2014;Trezzi et al 2020).…”

Section: Resultssupporting

confidence: 90%

Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Salomão¹,

Trezzi²,

Pagnoncelli³

et al. 2021

Commun. Plant. Sci.

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Weed management with herbicides requires favorable environmental conditions, that maximize efficiency, such as soil humidity and timing of application. The aim of this study was to assess the effect of the application timing of bentazon and glyphosate herbicides on the control and activity of antioxidant enzymes in Ipomoea grandifolia, under different conditions of soil water availability. Two experiments, one for each herbicide (bentazon and glyphosate), were conducted in a factorial design with four replicates. The first factor was the two rates of each herbicide (504 and 720 g i.a. ha -1 of bentazon and 651 and 911.4 g i.a. ha -1 of glyphosate). The second factor was the six application times (1 am; 5 am; 9 am; 1 pm; 5 pm and 9 pm). The third factor, soil water content (100% and 50% of field capacity). Plus, two controls without herbicide application. At 21 days after application (DAA) of bentazon and 28 DAA of glyphosate, the fresh mass of the aboveground plants was measured. In addition, the activities of the enzymes superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) were determined. For plants under water restriction, an increase of approximately 20% in fresh mass was observed compared in plants without water restriction, indicating lower control efficiency under water stress condition. For bentazon, at 1 pm has been observed the lowest herbicide efficiency, the other times were the most efficient, and did not differ. For glyphosate, the application at 9 am was the most efficient, while at 1 am provided the worst control efficiency. Higher CAT and SOD activities after bentazon application were observed at 1 pm. Among the three enzymes evaluated, SOD presented the highest activity after glyphosate application. Generally, the times of the day with the highest peak of enzymatic activity were distinct between with and without water restriction. Highlighted Conclusions1. Water restriction reduces the efficiency of bentazon and glyphosate. 2. Better efficiency for bentazon was observed at 1 am, 5 am, 9 am, 5 pm and 9 pm. 3. Better efficiency for glyphosate was observed at 9 am.

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“…A URA afeta diretamente o status hídrico da planta, modifi cando a abertura estomática e a permeabilidade cuticular (ZANATTA et al, 2007). Em teoria, a hidratação da cutícula favorece a difusão de herbicidas hidrossolúveis, como o glifosato.…”

Section: Umidade Relativa Do Arunclassified

Fatores Ambientais Que Afetam a Eficácia De Glifosato: Síntese Do Conhecimento

Vidal

Pagnoncelli

Fipke

et al. 2014

PES

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A presente revisão objetivou organizar e sintetizar o conhecimento disponível na literatura com respeito aos fatores ambientais que afetam a efi cácia do glifosato. Foram abordados os seguintes aspectos: temperatura, umidade relativa do ar, solo, irradiância, disponibilidade de nutrientes e o estado nutricional das plantas, ocorrência de chuva após a aplicação do produto, assim como a interação entre o ambiente e as características morfológicas e fenológicas das plantas. Verifi cou-se que, em geral, temperatura e estado nutricional das plantas ótimos para o crescimento vegetal favorecem a efi cácia do glifosato no controle de infestantes. Umidade relativa do ar superior a 65 % tende a facilitar a absorção do herbicida. Irradiância elevada auxilia a ação de glifosato, mas há espécies vegetais em que o sombreamento parcial favorece o controle com o herbicida. A maioria dos trabalhos da literatura consultados trata da avaliação do efeito de fatores isoladamente. No entanto, como em condições reais ocorre a associação dos fatores de estresse mencionados há a necessidade de trabalhos de campo que avaliem a interação entre eles.

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Teores de água no solo e eficácia do herbicida glyphosate no controle de Euphorbia heterophylla

Cited by 9 publications

References 28 publications

Low level resistance of wild poinsettia biotypes to glyphosate and alternative chemical control

Low level resistance of wild poinsettia biotypes to glyphosate and alternative chemical control

Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Fatores Ambientais Que Afetam a Eficácia De Glifosato: Síntese Do Conhecimento

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