Abstract
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. involucrataand Ipomoea sp found growing within the yam plots. A high mean inoculum densities of 3.0 ± 0.5 × 106 colony forming unit/g of soil was estimated in the soil samples obtained from the yam plots
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