Seletividade dos herbicidas S-metolachlor e alachlor para o feijão-carioca

Lamego, Fabiane Pinto; Basso, Claudir José; Vidal, Ribas Antônio; Trezzi, Michelangelo Müzell; Santi, Antônio Luis; Ruchel, Q.; Kaspary, Tiago Edu; Gallon, Mônica da Silva

doi:10.1590/s0100-83582011000400018

Cited by 15 publications

(24 citation statements)

References 14 publications

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“…The value of D 80 (determined on the dry mass reduction data) may be used to establish the herbicide dose for field conditions (Lamego et al, 2011). When fluazifop was sprayed at 2 a.m. and at 6 a.m., the values of D 80 was 25% lower than the D 80 values estimated for the herbicide application at 11 a.m. and 4 p.m.…”

Section: Resultsmentioning

confidence: 99%

“…The grain yield of the common bean (Phaseolus vulgaris) crop is strongly reduced because of the weed interference (Vidal et al, 2010;Lamego et al, 2011;Vidal, 2012, 2013). The control of vegetation with herbicides is one of the main tactics of weed management (Lamego et al, 2011;Kalsing and Vidal, 2012;Cieslik et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The control of vegetation with herbicides is one of the main tactics of weed management (Lamego et al, 2011;Kalsing and Vidal, 2012;Cieslik et al, 2014). The plant of Urochloa plantaginea (Brachiaria plantaginea) is a grass weed with annual life cycle and reproduction by seeds.…”

Section: Introductionmentioning

confidence: 99%

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Fluazifop-P-Butyl Efficacy as a Function of Application Time and Herbicide Dose

et al. 2017

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-Grass weeds are common in summer crops and strongly decreases the grain yield of the common bean crop. The time of herbicide application influences the variability of environmental conditions and affects the product performance. The objectives of this work were to identify the time of fluazifop-p-butyl (fluazifop) application which gives best grass weed control in the common bean crop and to elucidate the environmental variables most important for the efficacy of this herbicide. Field experiments were conducted involving five application times (2 a.m., 6 a.m., 11 a.m., 4 p.m. and 9 p.m.) and five doses of fluazifop (80, 110, 140, 170 and 200 g ha -1 ), with additional no-herbicide control. At the time of the herbicide application it was determined the air temperature, relative humidity, the photosynthetically active radiation (PAR) and the leaf angle, whereas the weed control and the dry mass of the weed Urochloa plantaginea was assessed at 20 days after treatment (DAT). Efficacy on grass control with fluazifop was dependent on the herbicide dose and on the time of day that the product was applied. Spray at early morning hours (6 a.m.) showed better efficacy on weed control in relation to periods during warmer conditions of the day (11 a.m. and 4 p.m.). Nocturnal fluazifop application had better weed control when compared to herbicide sprayed in the afternoon. The air temperature, relative humidity and PAR were correlated to weed leaf angle, which correlated the most with fluazifop performance.Keywords: chemical control, environmental conditions, leaf angle, conceptual map. de aplicação (2h, 6h, 11h, 16h e 21h) e cinco doses de fluazifop (80, 110, 140, 170 RESUMO -Gramíneas são infestantes comuns nos cultivos de verão e causam grande prejuízo à cultura do feijão. O horário de aplicação do herbicida influencia nas condições ambientais, alterando o desempenho do produto. Este trabalho teve como objetivos identificar o horário de aplicação de fluazifop-p-butyl (fluazifop) que confere melhor desempenho ao herbicida no controle de gramíneas na cultura do feijão e elucidar as variáveis ambientais mais importantes para a eficácia desse herbicida. Foi conduzido um experimento em campo envolvendo cinco horários

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluazifop-P-Butyl Efficacy as a Function of Application Time and Herbicide Dose

et al. 2017

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“…Em outro estudo, reduziu-se 98% da infestação da espécie Setaria viridis no feijoeiro com a aplicação de 0,6 kg ha -1 de trifluralin na condição de pré-emergência (Soltani et al, 2010). Também se constatou redução da infestação de U. plantaginea e Digitaria sanguinalis na cultura do feijão através do uso de herbicidas residuais (Lamego et al, 2011 (1) Médias com letras distintas diferem entre si pelo teste t (p<0,05), sendo que letras minúsculas a direita (a, b) comparam médias de doses de um mesmo herbicida, em uma mesma cultivar; letras maiúsculas a direita (A, B, C) comparam médias de herbicidas em uma mesma dose, em uma mesma cultivar; e, letras maiúsculas a esquerda (R, S e T, U) comparam médias de herbicidas em uma mesma dose, em cultivares diferentes.…”

Section: Resultsunclassified

“…Além disto, as plantas daninhas que emergem nas áreas tratadas têm crescimento atrasado (Lamego et al, 2011), o que reduz o seu impacto na cultura e facilita as ações de controle em pós-emergência. No entanto, para se obter sucesso na redução da infestação do U. plantaginea com herbicidas residuais, devem-se combinar as ações de manejo em pré e pós-emergência da cultura do feijão.…”

Section: Resultsunclassified

Controle de Urochloa plantaginea com herbicidas residuais e performance agronômica de dois cultivares de feijoeiro

Kalsing

Vidal

2014

RBHerbicidas

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Resumo -O objetivo deste trabalho foi avaliar os efeitos da utilização de herbicidas residuais, aplicados em pré-emergência do feijoeiro, sobre a redução da infestação de plantas daninhas e o desempenho agronômico da cultura. Foram realizados dois experimentos a campo, sendo que um tinha o cultivar UFT -06 (Grupo Carioca, ciclo curto e porte ereto) e o outro o cultivar IPR Graúna (Grupo Preto, ciclo longo, hábito prostrado). Os tratamentos foram constituídos da aplicação dos herbicidas pendimethalin (1,2 e 1,4 kg ha -1 ) e trifluralin (1,2 e 1,4 kg ha -1 ); e, dimethenamid (1,4 e 1,6 kg ha -1 ) e S-metolachlor (1,4 e 1,6 kg ha -1 ), e mais testemunha com e sem (TSC) controle. Nas áreas experimentais predominavam infestação de Urochloa plantaginea (papuã). Avaliou-se a densidade e a massa desta espécie daninha, e o número de legumes e a produtividade do feijoeiro. Trifluralin foi o herbicida que mais reduziu a infestação da planta daninha e aumentou o rendimento do feijoeiro, quando comparado aos demais produtos. O cv. de feijão UTF-06 foi mais competitivo com U. plantaginea do que IPR Graúna. Os tratamentos com herbicida reduziram a infestação da infestante, mas isso não resultou em maior produtividade do feijoeiro, quando comparado com o tratamento capinado. Palavras-chaves: Brachiaria plantaginea, competição, interferência, manejo integrado Abstract -The objective of this study was to evaluate the effects of the use of residual herbicides applied in the pre-emergence of beans, on reducing weed infestations, and the agronomic performance of the crop. Two field experiments were conducted, one had the cultivar UFT -06 (Carioca Group, short cycle and erect) and another, the IPR Graúna (Black Group, long cycle, prostrate habit). The treatments consisted of application of the herbicides pendimethalin (1.2 and 1.4 kg ha -1 ) and trifluralin (1.2 and 1.4 kg ha -1 ); and dimethenamid (1.4 and 1.6 kg ha -1 ) and Smetolachlor (1.4 and 1.6 kg ha -1 ), and weedy and weed-free checks for comparison. In the experimental areas, Urochloa plantaginea (Alexander grass) infestation predominated. It was evaluated the density and the biomass of this weed, and the number of pods and yield of the bean. Trifluralin was the herbicide that most reduced the infestation of the weeds and increased the yield of the bean, when compared to the other products. The UTF-06 bean cv. was more competitive with U. plantaginea than IPR Graúna. The treatments with herbicide reduced the infestation of weed, but this did not result in higher yields of bean, compared to the weed-free treatment.

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Effect of the use of pre- and post-emergence herbicides on nodulation and production of cowpea (Vigna unguiculata L.) in the Amazonian savannah

et al. 2020

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As a control measure against weeds, the use of herbicides is an effective and inexpensive alternative. However, there are no products recommended for the cultivation of cowpea in Brazil, making it necessary to search for alternative solutions. The objective of this study was to evaluate the effect of herbicides applied in the pre- and post-emergence on cowpea nodulation and production under conditions of the Amazonian savannah. Two experiments were carried out in a randomized block design with four replicates, using the cowpea cultivar BRS Aracê subjected to the pre-emergence herbicides: Metribuzin, Sulfentrazone, Smetolachlor, Pendimethalin, Oxadiazon, Alachlor, Metribuzin + Pendimethalin, Metribuzin + Alachlor and Quizalofop-p-ethyl, Bentazon, Fomesafen, Imazethapyr, Imazamox + Bentazon, Quizalofop-p-ethyl + Imazethapyr, Quizalofop-p-ethyl + Imazamox and Quizalofop-p-ethyl + Bentazon, and post-emergence herbicides: Quizalofop-p-ethyl, Bentazon, Fomesafen, Imazethapyr, Imazamox + Bentazon, Quizalofop-p-ethyl + Imazethapyr, Quizalofop-p-ethyl + Imazamox, and Quizalofop-p-ethyl + Bentazon. The number of nodules in each plant, the dry matter of nodules, dry matter of roots and the grain yield were evaluated. According to the results obtained, the management of weeds in pre- or post-emergence according to the herbicide used affects the nodulation and productivity of cowpea under the conditions of the Amazonian savannah. The herbicides Metribuzin in preemergence,and Fomesafen and the mixture of Quizalofop-pethyl + Imazethapyr in post-emergence are not recommended for weed control in cowpea. The application of Oxadiazon, Alachlor, and Pendimethalin in pre-emergence can be considered interesting because they do not inhibit the development of the root system or the nodulation of cowpea which provides agreater grain yield. Regarding weed control strategies at postemergence, the application of the herbicide Imazethapyr and the combination of the herbicides quizalofop-p-ethyl + imazamox, Quizalofop-p-ethyl + Bentazon and Imazamox + Bentazon allow satisfactory levels of grain yield, root system development and nodulation of cowpea.

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Seletividade dos herbicidas S-metolachlor e alachlor para o feijão-carioca

Cited by 15 publications

References 14 publications

Fluazifop-P-Butyl Efficacy as a Function of Application Time and Herbicide Dose

Fluazifop-P-Butyl Efficacy as a Function of Application Time and Herbicide Dose

Controle de Urochloa plantaginea com herbicidas residuais e performance agronômica de dois cultivares de feijoeiro

Effect of the use of pre- and post-emergence herbicides on nodulation and production of cowpea (Vigna unguiculata L.) in the Amazonian savannah

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