Pulverized black pepper seeds were evaluated in the lab oratory for toxicity, reduction of Fi progeny and repellency effect against aduflts of Sitophilus oryzae (L.), Rhizoper— tha dominica (F.) and ‘ribolium castanetun (Herbst.). Data showed that black pepper powder was very toxic to . y and gave complete protection to stored wheat after 7 days from the treatment. Whereas, it had relative toxic effects against T. castaneum (73%), and moderately toxic to R. dominica adults at 4% concentration for the same period. Reduction of the Fi generation at concentrations between l—4% was in the range of 100%, 38—91% and 42—78% for S. T. castaneujn and R. dominica, respectively. Potential repellency of the pepper powder was very obvious to T. castaneum adults at all tested concentrations. While the repellency effect to R. dominica and S. oryzae adult was only high at 2 and 4% concentrations. The results indi cated that black pepper powder could be used as a protectant for grain against certain stored product insects.