Callosobruchus maculatus (Fabricius) is a serious pest of stored grains, worldwide. In an attempt to find natural and cheaper methods of control of stored product pests some traditionally useful materials have been evaluated for their pesticidal properties. Biopesticidal efficacy of Datura inoxia (Miller) and Dodonaea viscosa Linnaeus (Jacquin) in acetone and methanol extracts have been tested on C.maculatus (Coleoptera: Bruchidae) fed on cowpea, Vigna unguiculata (W) seeds. All the concentrations viz. 5, 10 and 20% of the acetone and methanol extracts were found to be effective in controlling the pest C. maculatus. The extracts were effective in increasing mortality, decreasing the oviposition and F1 adult emergence of the insect pest. Thus, the botanicals acted as insect antifeedant and the order of toxicity of various treatments on cowpea weevil was: Acetone extract D. inoxia> Methanol extract of D. inoxia> Acetone extract of D. viscosa> Methanol extract of D. viscosa. 20% acetone extract of D. inoxia was most effective among all the four extracts. Hence it is recommended that the two plants may be exploited to control C.maculatus in particular and against other pests in general. However some more biochemical and biological parameters of both the plants and insect species may be taken under consideration for efficient and enlarged scale control of pest species.