Data/hora: 09/06/2024 11:40:27

Provedor de dados: 	102	
País: 	Brazil	
Título: 	Cultural practices and genetic resistance as factors affecting soybean stem canker and plant yield in the Cerrado	
Autores: 	FREITAS,MARCOS A.; CAFÉ FILHO,ADALBERTO C.; NASSER,LUIZ C. B.	
Data: 	2002-02-01	
Ano: 	2002	
Palavras-chave: 	Glycine max; Tillage; Phomopsis phaseoli f.sp. meridionalis.	
Resumo: 	Field experiments were conducted in the 1995-96 soybean (Glycine max) growing season to evaluate the effects of cultural practices and host genetic resistance on the intensity of soybean stem canker, caused by Diaporthe phaseolorum f.sp. meridionalis (Dpm). Experiments were conducted in a commercial field severely infected in the previous (1994-95) season. In one study, minimum tillage (MT) and no-tillage (NT) cropping systems were investigated for their effects on disease development and on plant yields in cvs. FT-Cristalina (susceptible) and FT-Seriema (moderately resistant). Another study evaluated the effects of plant densities (8, 15, 21 and 36 plants/m) on disease development in cvs. FT-Cristalina, FT-101 (moderately resistant) and FT-104 (resistant). Disease incidence and severity were consistently lower in NT than in MT, and plant yields were increased by 23% and 14% in the NT system for the susceptible and moderately resistant cultivars, respectively, compared to the yields in the MT system. The Gompertz and Logistic models described well the disease progress curves in all situations. For both susceptible and moderately resistant cultivars, disease severity increased proportionately to the increase in plant densities. At the end of the season, 100% of the plants of cv. FT-Cristalina were infected by Dpm, at all plant densities. Disease levels on cv. FT-101 were intermediate while only very low disease levels were recorded on cv. FT-104. There was a consistent negative correlation between stem canker severity and yield. Some practices demonstrated potential for direct application in disease control, and could be combined considering their additive effects.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000100001	
Editor: 	Sociedade Brasileira de Fitopatologia	
Relação: 	10.1590/S0100-41582002000100001	
Formato: 	text/html	
Fonte: 	Fitopatologia Brasileira  v.27 n.1 2002	
Fonte: 	info:eu-repo/semantics/openAccess