Concentric leaf spot of yam (Dioscorea spp) in South-western Nigeria

The etiology and epidemiology of concentric leaf spot and seedling blight diseases of yam (Dioscorea spp) was investigated at Jbadan, south western Nigeria, in the low land humid tropics. Sclerotium rolfsii was associated with the concentric leaf spot and seedling blight of yam. The pathogen was als...

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Bibliographic Details
Published in:Mycopathologia (1975) 1999-10, Vol.48 (1), p.33-36
Main Author: Amusa, NA
Format: Article
Language:English
Subjects:
Dioscorea
Nigeria
Sclerotium rolfsii
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Summary:The etiology and epidemiology of concentric leaf spot and seedling blight diseases of yam (Dioscorea spp) was investigated at Jbadan, south western Nigeria, in the low land humid tropics. Sclerotium rolfsii was associated with the concentric leaf spot and seedling blight of yam. The pathogen was also harbored by weeds namely Mucuna pruriensis, Commelina erecta, ipomea triloba, I. involucrata and Ipomoea sp found growing within the yam plots. A high mean inoculum densities of 3.0 plus or minus 0.5 x 10 super(6) colony forming unit/g of soil was estimated in the soil samples obtained from the yam plots.
ISSN:0301-486X