Experiments were carried out to evaluate the efficacy of using a modified atmosphere of approximately 1% 02 plus 99% N2 against some stored product pests, namely, the grain and flour mite Tyrophagus Putrescentiae (schrank) and Aleuroglyphus ovatus Troupea, and the cow-pea beetle, Callosobruchus maculatus, (F.) in the laboratory at 26°C as well as 6°C. Results showed that the time required to achieve certain kill for the various stages of the two mites species and insect species was con-siderably longer at the lower temperature than at the higher one. Results showed also that, the adult stage of the two experiment‌ed mite species was the most susceptible to the modified atmosphere, whereas the eggs were the most tolerant. Concerning, C.maculatus the adult as well as the larval stages were susceptible, while the eggs and the pupae were slightly more toler-ant. The LT 99-values regestired for the various stages of T.putrescentiae were 13, 15, 14 and 23 days at 26°C and 29, 35, 32 and 60 days at 6°C for the adults, nymphs, larvae, and eggs, respective‌ly. while the LT99-values of A.ovatus 'were 23, 17, 21 and 32 days at 26°C and 27, 34, 36 and 32 days at 6°C for the various stages, respec‌tively, but, were 5.4, 26, 29 and 31 days at 26°C and 17, 34, 48 and 28 days at 6°C for adults, larvae, pupae and eggs of C.maculatus, re‌spectively. The obtained results revealed that T.Putrescentiae was the more tolerant than A.ovatus within all stages, while C.maculatus, was the most susceptible to the effect of the gas.