Data/hora: 23/09/2024 12:58:50

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	29/07/1996	
Data da última atualização: 	29/07/1996	
Autoria: 	GUY, S. O.; GRAU, C. R.; OPLINGER, E. S.	
Afiliação: 	University of Wisconsin.	
Título: 	Effect of temperature and soybean cultivar on Metalaxyl efficacy against Phytophtora megasperma f.sp. glycinea.	
Ano de publicação: 	1989	
Fonte/Imprenta: 	Plant Disease, v.73, n.3, p.236-239, 1989.	
Idioma: 	Inglês	
Conteúdo: 	Four soybean cultivars, treated or not treated  with metalaxyl, were evaluated at 24, 28 and 32C for reaction to two isolates of race 3 of Phytophtora megasperma f.sp. glycinea. In addition, metalaxyl was evaluated at rates of 0, 0.05, 0.25, 0.60 and 1.20ug\\ml at 24,28 and 32C.  Internal stem discoloration was measured acropetally from the point ofinoculation and was positively correlated (r=0.90) with plant mortality. Lesions were longest at 32C and shortes at 24C for all cultivars and rates of metalaxyl. Regression analysis  of metalaxyl concentration vs. lesions length showed a difference in intercepts, but not slopes, with the highest interceptat 32C and the lowest at 24C. Metalaxyl was effective in reducing lesion length at all temperatures, in all cultivars, and with both pathogen isolates. However, greater amounts of metalaxyl were needed to reduce disease severity at 32C than at 24 and 28C. The Rps, resistance gene expressed an incompatible reactions of 24C but a compatible reaction at 32C.	
Palavras-Chave: 	Disease; Evaluation; Evolucao; Resistance; Soybean.	
Thesagro: 	Doença; Glycine Max; Phytophthora Megasperma; Resistência; Soja.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (6894-1) - ADP - SP - -- -  -  - 1991.03806 - DIS