SELECTIVITY OF HERBICIDES APPLIED IN POST-EMERGENCE OF SHOWY CROTALARIA

• Autor(a) principal: Braz, Guilherme Braga Pereira
• Data de Publicação: 2016
• Outros Autores: Oliveira Júnior, Rubem Silvério de, Constantin, Jamil, Takano, Hudson Kagueyama, Godinho, Fernanda Brunetta
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Caatinga
• Texto Completo: https://periodicos.ufersa.edu.br/caatinga/article/view/5583
• topic: Crotalaria spectabilis. Cover crops. Intoxication by herbicides. Weed management.; Crotalaria spectabilis. Culturas de cobertura. Intoxicação por herbicidas. Manejo de plantas daninhas.

Weed control is essential to reduce or eliminate the interference of weeds on crops. Chemical control with the application of herbicides consists of the most used method, with this aim in grain producing areas. Information about the selectivity of herbicides to C. spectabilis (showy crotalaria) are scarce, which are critical for the management of this species as a crop. One field experiment was performed to evaluate the selectivity of herbicides applied in post-emergence of showy crotalaria. The herbicides bentazon (720 and 576 g ha-1), imazethapyr (106 and 79.5 g ha-1), pyrithiobac-sodium (84 g ha-1), flumiclorac (60 g ha-1), flumiclorac in sequential application (30 / 30 g ha-1), imazethapyr + bentazon (106 + 480 g ha-1), and clethodim + quizalofop (96 + 100 g ha-1) were applied in plants with four true leaves, also using a control without herbicide application. Pyrithiobac-sodium and flumiclorac isolated and the tankmix of imazethapyr + bentazon provided greater injuries to showy crotalaria, also affecting the final plant height. Pyrithiobac-sodium (84 g ha-1) was not selective to showy crotalaria. The herbicides imazethapyr (79.5 g ha-1), flumiclorac (sequential application), and bentazon (576 g ha-1), despite the association between clethodim + quizalofop, can be used for weed management in showy crotalaria crop.