Evaluation of the efficacy of some selected plant materials (botanicals) in the control of cowpea weevil (Callosobruchus maculatus f.) on stored cowpea
Laboratory experiments were conducted to assess the efficacy of three botanicals on cowpea weevil, (Callosobruchus maculatus). Treatments consisted of Citrus peel power (CPP) Occimum spp. Leaf powder (OLP) hot pepper power (HPP) at dosage rate of 1g /20g cowpea seeds, a synthetic insecticide, Pirimiphos-methyl dust (PMD) at 0.1g /20g cowpea seeds as check and a control. The experiments were laid out in a completely randomized design (CRD) replicated three times. Results revealed that HPP was most effective in increasing adult mortality, in reducing progeny emergence and cowpea seeds damage. The maximum shelf life of the botanicals was attained at 12weeks after treatment (WAT), except that the effectiveness of HPP persisted for up to 16 WAT and was more effective than other botanicals at this period. HPP is hereby recommended in the control of C. maculatus on stored cowpea seeds.
Keywords: Botanicals, Cowpea Weevil and Stored Cowpea