To determine the mortality of the egg stage, the grain along with the eggs were treated with microwave energy and then returned to favorable environment at 35oC and 70% relative humidity, where the eggs can develop into larvae. After about a week, the numbers of larvae that emerged from the eggs were counted. For the larval stage, the experiments were conducted in the same way as for the adult insects. The pupae were subjected to microwave energy and returned to a favorable environment (35oC and 70% r.h). After one week the total number of adults that emerged from pupae was counted.