Cowpea seeds bruchid (Callosobruchus maculatus F.) is an important pest of cowpea with a reputation of causing high grain loss both in quantity and quality. The insecticidal efficacy of nine plant oils [neem (Azadirachta indica A. Juss), groundnut (Arachis hypogaea L.), Castor (Ricinus communis L.), Palm fruit mesocarp and kernel (Elaeis guineensis L.), coconut (Cocos nucifera L.), Olive (Olea europaea L.), Soybean [Glycine max (L.) Merr.] and melon (Cucumeropsis mannii Naudin.) against this arthropod was evaluated under laboratory temperature of 26 ± 3 °C and 74 ± 4% R.H at the Crop and Environmental Protection Laboratory of the Federal University of Agriculture, Makurdi, Nigeria. The experiment involved exposing adult C. maculatus to 3 mLkg-1 of the oils admixed with Ife brown cowpea seeds. The set up was a completely randomized design with four replicates. Results show that all the plant oils tested had a significant (p70% at 72 hours after exposure to the oils. Oviposition, F1 progeny, the number of damaged seeds and weight loss were significantly reduced (p