Título:	Comparative yield loss estimates due to blast in some upland rice cultivars.
Autoria:	PRABHU, A. S. FARIA, J. C. ZIMMERMANN, F. J. P.
Afiliação:	ANNE SITARAMA PRABHU, CNPAF; JOSIAS CORREA DE FARIA, CNPAF; FRANCISCO JOSÉ PFEILSTICKER ZIMMERMANN, CNPAF.
Ano de publicação:	1989
Referência:	Fitopatologia Brasileira, v. 14, n. 3/4, p. 227-232, out./dez. 1989.
Conteúdo:	Leaf and panicle blast severities and grain yield of some upland rice cultivars were measured in three successive years in field plots unprotected or protected with fungicides. The variation in disease severities in different plots was used to establish relationships between severity of leaf and panicle blast and yield. Linear multiple regression equations for each cultivar by year were developed to estimate the yield decrease in different cultivars per unit increase in disease. Leaf blast severities at maximum tillering or booting stage and panicle blast 25 days after heading accounted for variation in grain yield in most of the cultivars. General equations combining five early and eight medium-duration rice cultivars were developed. The estimated percentage losses in grain yield due to blastwere 2.7 and 1.5 for one percent increase in blast in the early and medium-duration cultivars, respectively.
Thesagro:	Arroz Brusone Fungo Oryza Sativa Perda Pyricularia Oryzae Doença de Planta
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPAF)