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Effects of Ash Levels and Bean Varieties on Population Density of Bean Weevils, Acanthoscelides Obtectus
(1990) Kyamanywa, S.; Makerere University
The population patterns of eggs, larvae+puparia in the bean plants and leaf punctures made by adults were investigated during cropping (March-July; October-January) and noncropping (July-October) seasons at two sites in Kenya. The beans planted in noncropping seasons had more leaf punctures, eggs,larvae+puparia than beans planted in cropping seasons. Beans planted in noncroppjng season attracted unusually high population from surrounding weeds 3S well as previous crop which cause severe damage. Under field conditions Qphiomyia spencerella Greathead and Ophiomyia phaseoli Tryon were the species of beanflies infesting the bean plants in all seasons. Both O. spencerella and O. phaseoli normally oviposited in the stems of bean seedlings.