Data/hora: 06/06/2024 06:30:15

Provedor de dados: 	87	
País: 	Brazil	
Título: 	A field survey of crop management practices and distribution of ALS resistant Euphorbia heterophylla in two states in southern Brazil	
Autores: 	Vidal,R.A.; Winkler,L.M.; Hernandes,G.C.; Fleck,N.G.; Merotto Jr.,A.; Trezzi,M.M.	
Data: 	2004-09-01	
Ano: 	2004	
Palavras-chave: 	Imazethapyr; Wild poinsettia; Herbicide mixtures.	
Resumo: 	Herbicide resistance was reported in Brazil almost ten years ago. One of the main weeds with herbicide resistance is wild poinsettia (Euphorbia heterophylla). This work evaluates the distribution of ALS-resistant E. heterophylla in two states in southern Brazil and determines the major contributing management causes for weed resistance selection in the area. E. heterophylla seeds from 148 sites located in Paraná and Rio Grande do Sul were sampled during 2001 and 2002. Farmers provided specific site data for weed control, tillage system, crop rotation and harvesting operations during previous years. ALS resistant E. heterophylla biotypes were found widely distributed in the survey area. Data analysis suggests seed dissemination is unlikely to explain the widespread distribution of resistance. The most probable factor for the selection of the resistant E. heterophylla is the persistent high use of ALS-inhibiting herbicides over time. Indirect evidence is presented demonstrating the need to educate legislators and farmers about the importance of herbicide mixtures as a strategy to prevent herbicide resistance.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582004000300010	
Editor: 	Sociedade Brasileira da Ciência das Plantas Daninhas	
Relação: 	10.1590/S0100-83582004000300010	
Formato: 	text/html	
Fonte: 	Planta Daninha  v.22 n.3 2004	
Fonte: 	info:eu-repo/semantics/openAccess