Data/hora: 12/06/2024 14:06:35

Provedor de dados: 	87	
País: 	Brazil	
Título: 	Multiple resistance of Conyza sumatrensis to Chlorimuron­ethyl and to Glyphosate	
Autores: 	Santos,G.; Oliveira Jr.,R.S.; Constantin,J.; Francischini,A. C.; Osipe,J. B.	
Data: 	2014-06-01	
Ano: 	2014	
Palavras-chave: 	EPSPs; Sulfonilureas; ALS-inhibitors; Sumatran fleabane; Multiple resistance.	
Resumo: 	Weed resistance to herbicides has been a major issue in Brazil, mainly due to the inefficiency of the herbicides used in no-till areas and to the high cost of these herbicide treatments. Failures in controlling the weed Conyza have been reported in Western and Northern grain crop areas in Paraná (Brazil). This work aimed to evaluate the potential occurrence of C. sumatrensis biotypes resistant to the herbicides chlorimuron-ethyl and glyphosate. Experiments were carried out under greenhouse conditions with four biotypes (Cascavel-2, Toledo-4, Tupãssi-6, and Assis Chateaubriand-7) possibly resistant to, as well as a population considered susceptible to chlorimuron-ethyl and glyphosate. To obtain dose-response curves, eight herbicide doses of chlorimuron-ethyl (0, 2.5, 5, 10, 20, 40, 80 and 160 g ha-1) and glyphosate (0, 90, 180, 360, 720, 1,440, 2,880 and 5,760 g e.a. ha-1) were applied and weed control and shoot biomass evaluations were made. Results provided evidence that two biotypes (Cascavel-2 and Tupãssi-6) were resistant to glyphosate and four biotypes (Cascavel-2, Toledo-4, Tupãssi-6 and Assis Chateaubriand-7) were resistant to chlorimuron­ethyl. Multiple resistance to glyphosate and chlorimuron was confirmed for biotypes Cascavel­2 and Tupãssi 6. This is the first report on multiple resistance in Conyza sumatrensis, worldwide.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200019	
Editor: 	Sociedade Brasileira da Ciência das Plantas Daninhas	
Relação: 	10.1590/S0100-83582014000200019	
Formato: 	text/html	
Fonte: 	Planta Daninha  v.32 n.2 2014	
Fonte: 	info:eu-repo/semantics/openAccess