Abstract: In this study, effects of gamma radiations and malathion on the flour beetle, Tribolium confusum were studied. Survival of adults after irradiation was decreased with increasing dos of both irradiation and malathion treatment. In adult irradiation LD50 and LD99 values were estimated as 94.62 and 198.87 Gy, respectively. In malathion treatment LD50 and LD99 values were determined as 0.012 mg/cm2 and 0.131 mg/cm2 for adults.