Trimethacarb, a carbamate insecticide, was evaluated at four concentrations as a grain protectant of soft red winter wheat against four species of common stored-product insects. Its effectiveness was assessed using two criteria: mortality of adults after 5 days exposure on the treated grain and suppression of the F 1 generation's emergence. At the highest rate of 25 ppm, mortality of the confused flour beetle and the rice weevil was 24.0 and 71.5%, respectively. The mortality of the adult lesser grain borers and Angoumois grain moths after 5 days was 100 and 93.9%, respectively, at 5.0 ppm. There was 68.5% suppression of the rice weevil's emergence at 25 ppm while for the lesser grain borer and the Angoumois grain moth there was greater than 95% suppression at rates of 5.0 ppm or higher.