Data/hora: 27/07/2024 02:53:31

Provedor de dados: 	65	
País: 	Brazil	
Título: 	Susceptibility of Echinochloa populations to cyhalofop-butyl in Southern region of Brazil and impact of the weed phenology on its efficacy of control	
Autores: 	Kalsing,Augusto; Tronquini,Sérgio Mateus; Mariot,Carlos Henrique Paim; Rubin,Rogerio da Silva; Bundt,Angela Da Cas; Fadin,Dauri Aparecido; Marques,Luiz Henrique.	
Data: 	2017-01-01	
Ano: 	2017	
Palavras-chave: 	Barnyardgrass; Development stage; Imidazolinones; Echinochloa crus-galli; Echinochloa colona.	
Resumo: 	ABSTRACT: Cyhalofop-butyl stands out among the herbicides in the control of imidazolinone-resistant Echinochloa species; but, rice farmers are not always satisfied with the control achieved with this herbicide. The objectives were to evaluate in regional scale the susceptibility of Echinochloa populations to cyhalofop-butyl, and quantify the effect of the weed phenology on its efficacy of control. For this, three trials were carried out under greenhouse conditions with a fully random design, using Echinochloa populations collected in rice fields in the southern region of Brazil. In two trials, the susceptibility level of 156 (2012/13 growth season) and 103 (2013/14 growth season) populations were evaluated with the application of cyhalofop-butyl at 360g ha-1. In other trial, in which treatments were arranged in a bi-factorial design (A = 6 x B = 5), it was evaluated six cyhalofop-butyl rates and five phenological stages of E. crus-galli populations. Echinochloa populations had showed differential susceptibility to cyhalofop-butyl, especially in the 2013/14 growth season, where 20 out of the 103 populations had control lower than 90%. The efficacy of this herbicide was inversely proportional to the phenological stage, and the application timing delay contributed directly to the decrease of susceptibility to the herbicide. Cyhalofop-butyl is an effective alternative to control imidazolinone-resistant Echinochloa populations, as long as the application timing occurs in the early phenological stages (2 to 4 leaves).	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000400153	
Editor: 	Universidade Federal de Santa Maria	
Relação: 	10.1590/0103-8478cr20160839	
Formato: 	text/html	
Fonte: 	Ciência Rural  v.47 n.4 2017	
Fonte: 	info:eu-repo/semantics/openAccess