Data/hora: 03/06/2024 02:23:40

Biblioteca(s): 	Embrapa Trigo.	
Data corrente: 	22/11/1999	
Data da última atualização: 	01/08/2017	
Autoria: 	FERNANDES, J. M.	
Afiliação: 	JOSÉ MAURÍCIO CUNHA FERNANDES, CNPT.	
Título: 	Epidemiological and biological aspects of Septoria nodorum Berk., a pathogen of wheat in eastern Washington.	
Ano de publicação: 	1985	
Fonte/Imprenta: 	Dissertation (Doctor of Philosophy) - Washington State University, Washington, Pullman.	
Páginas: 	127 f.	
Idioma: 	Inglês	
Notas: 	Orientador: HENDRIX, J. W.	
Conteúdo: 	Glume blotch of wheat ,a disease incited by Septoria nodorum (=Leptosphaeria nodorum ),was monitored through a succession of surveys during the period 1982-84 in eastern Washington . Findings revealed that infection in wheat occurs soon after seeddling emergence . Infection levels, varying upward of 70% in one of  the two years , remained consistently high from November to March , declined somewehat  in April-May  and dropped dramatically in late May and  June . It is speculated that such a decline is attributable to progressively fewer number of rainy days , lower relative humidities , shorter dew periods and elevating temperatures as the spring seasion advances . The viability of conidia of  Septoria nodorum exposed on plastic strip underwent a corresponding decline with the advent of warmer , drier weather. The source of inoculum associated with the onset of the disease was linked to the presence of spore bearing pycnidia on debris of the previous wheat crop . The perfect stage of the fungus was never found on wheat or graminicolous hosts around  and within wheat fields. Glume blotch effects on kernel weight of wheat was highly correlated with nodal infection . Substantial yield reduction ocurred when disease was imposed at the flowerig stage .According to criteria established by studying the relationship of organ infection and reduction in kernel weight it seemed unlikely that glume blotch is a disease of economic threat to the wheat industry in the Palouse. A new technique, involving the injection of inoculum into culms, was developed for evaluating cultivar reaction to glume blotch. A study of the survival of the fungus in hosts other than wheat indicated that downy chess (Bromus tectorum) may seerve as  an effective alternative host. This host may play a role in the epidemiology of the disease in eastern Washington as well. Notwithstanding the results reported elsewhere, virulence of locally collected wheat isolates of Septoria nodorum , was not altered by ten consecutive passages through barley.	
Palavras-Chave: 	Biology; Estados Unidos; Pathogen; Plant diseases; Wheats.	
Thesagro: 	Biologia; Doença; Doença de Planta; Epidemiologia; Fungo; Patógeno; Septoria Nodorum; Trigo; Triticum Aestivum.	
Thesaurus Nal: 	epidemiology; fungi.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Trigo (CNPT)	
Exemplares: 	CPAC - (16030-1) - ADD - TS - -- - T039/85 - FER - T039/85 - DIS
CNPT - (30667-1) - UPC - TS - -- - TS-1087 -  - 1087 - DIS