Sitophilus zeamais is a notorious field-to-store pest of maize in the Tropic. The use of chemical insecticides, regardless of its adverse effects has been the major means of managing this pest. In this study, bio-insecticides of plant origin was used to control maize weevil in the store. The dry fruits of Capsicum frutescens, Piper guineense and Aframomum melegueta were extracted with ethanol, using Soxhlet apparatus. The extracts and powders were evaluated on S. zeamais Motschulsky for mortality, oviposition and adult emergence. The long term storage of the treated maize was also investigated. The results obtained shows that all extracts and powders from C. frutescens and P. guineense caused 100 % mortality by day 12 of exposure with all extract concentrations and doses of powder applied. Powders of A. melegueta was able to achieve 100 % mortality only by day 12 of exposure. The extracts also suppressed oviposition and subsequent adult emergence. Extracts and powders of A. melegueta and P. guineense completely prevented infestation and hence damage of the treated maize grains for a period of three months. The result obtained suggests that extracts and powders of the test plants most especially that of P. guineense and C. frutescens can be utilized in protecting stored maize grains from infestation by S. zeamais.