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Leaf spot was identified as the major disease of winged bean (Psophocarpus tetragonolobus) in the Zaria area of Northern Nigeria. The disease was induced by (Cercospora psophocarpicola, Macrophomina phaseolina, Septosphaeria prolata, Phomopsis sp., Phoma sp., Curvularia ovoidea, Alteraria longissima and Lasiodiplodia theobromae. The severity of the leaf spot disease caused significant reduction in fresh pod length, dry pod yield and grain yield, but did not affect the number of pods produced per plant. Staked plants performed better than unstaked plants in terms of number of pods per plant, length of dry and fresh pods, dry pod and grain yield. Staking however, did not have any effect on the severity of leaf spot disease complex of the winged bean. It is therefore, advised that winged bean plants be staked for a better performance.
Journal of Applied Chemistry and Agricultural Research Vol. 7 2000-2001: pp. 42-47