Data/hora: 07/06/2024 05:23:15

Biblioteca(s): 	Embrapa Agricultura Digital.	
Data corrente: 	20/07/2009	
Data da última atualização: 	11/11/2010	
Autoria: 	ORLANDO, R. C. A.; ZAMBOLIM, L.; VALE, F. X. R. do; COSTA, L. C.; MARTINEZ, C. A.; BERGAMIN FILIHO, A.	
Afiliação: 	RODRIGO CAMPO ARANA ORLANDO, Universidad de Cordoba; LAÉRCIO ZAMBOLIM, UFV; FRANCISCO XAVIER RIBEIRO DO VALE, UFV; LUÍZ CLAUDIO COSTA, UFV; CARLOS ANTONIO MARTINEZ, UFV; ARMANDO BERGAMIN FILHO, ESALQ/USP.	
Título: 	Relationship between early - blight epidemic, healthy leaf area and tuber yield in potato.	
Ano de publicação: 	2005	
Fonte/Imprenta: 	Summa Phytopathologica, Botucatu, v. 31, n. 3. p.247-253, July/Sept. 2005.	
Idioma: 	Inglês	
Conteúdo: 	The field experiments, during the years 2001 and 2002, were carried out to determine the effect of early-blight (Alternaria solani), on potato (Solanum tuberosum) plant growth and tuber yield. Using the disease severity gradient method, plots with five different epidemic intensity levels (D1 to D5 in descending order) were obtained. The objective of this study was to correlate the disease severity (percentage leaf necrosis), the green leaf area index (GLA), duration of healthy leaf area (DHA) or radiation absorption by healthy leaf area (HAA), with tuber production in potato cultivar Bintje. Based on analysis of 100 plants, the tuber yield was linearly related (p<=O,O1) to the variables such as AUDPC (area under the disease progress curve), GLA, DHA and HAA. The variables that best explained the tuber yield were DHA (R2= 0.49 and 0.55 in 2001 and 2002, respectively) and HAA (R2= 0.48 and 0.54 in 2001, 2002, respectively). Separate analyses of each epidemic based on 20 plants each showed that the early-blight effect on DHA, HAA, yield and radiation use efficiency was dependent upon the epidemic severity. The highest yields were obtained from plots with least least disease index and highest DHA. In general, the main effect of early-blight epidemic was the reduction of both the leaf area and of the vegetative cycle of the plant, leading to tuber yield loss of 52.5% and 58.2% in 2001 and 2002, respectively.	
Palavras-Chave: 	Área foliar sadia; Perdas; Produção do tubérculo de batata Bintje; Severidade da epidemia da pinta-preta.	
Thesagro: 	Alternaria Solani; Epidemiologia; Solanum Tuberosum.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Agricultura Digital (CNPTIA)	
Exemplares: 	CNPTIA - (13454-1) - ADD - AP - PP -  -  -  - DIS