Evaluation of the Efficacy of Mixed Leaf Powders of Vernonia amygdalina (L.) and Azadirachta indica (A. Juss) Against Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)

C. E. Akunne, B. U. Ononye, T. C. Mogbo

Abstract


Plant leaf powders prepared from two plant species, Vernonia amygdalina (bitter leaf) and Azadirachta indica (neem) were used against adult cowpea weevil, Callosobruchus maculatus (Fab.) on cowpea grains. The leaf powders of Vernonia amygdalina L. (Va) and Azadirachta indica A. Juss (Az) were applied separately and in mixtures in the ratios of Va100%, Az100%, Va50%:Az50%, Va20%:Az80% and Va80%:Az20% respectively. They were evaluated under ambient laboratory conditions (30±3◦C and 75±3%). Mortality of adult C. maculatus at 24, 48 and 72hrs after treatment were recorded and compared with the control. All concentrations recorded higher mortality than the control except the mixture with the ratio Va20%:Az80%. The powder application at Az100% proportion caused the highest mortality, during the exposure period. It was also significantly (P<0.05) different from the control in adult mortality.

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