A preliminary study was conducted to test 16 crude extracts of selected plants on the mortality of Sitophilus zeamais adult. The bioassay was carried out by mixing crude extracts with rice grain at 0.5 and 0.25% concentrations by weight. It was found that crude extracts of Jatropha curcas (seed) and Annona muricata (seed) caused 100% mortality on weevil at 0.5% concentrations while at 0.25% they caused 96.7 and 98.3% mortality respectively. Crude extract of J. curcas (leaf) and Azadirachta indica (seed) at 0.5% caused 81.7 and 51.7% mortality respectively, while at 0.25% the mortality was 55% and 25%, respectively. Crude extracts of J. curcas seed and leaves, A. muricata (seed) and A. indica (seed) seem to have potential as botanical insecticides but further studies need to be conducted against S. zeamais.