The aim of this study was to investigatethe efficacy of controlled atmospheres (CA) of various carbon dioxide concentrations (25, 50, 75 and 100%) against the various stages of R.dominica at 20 and 30 + 1 oC and 65 + 5% RH. Furthermore, the efficacy of CA of 99.9% N2 against the various stages of R. dominica was studied at the two above mentioned temperatures and relative humidity. Experiments were conducted at the laboratory of the plant protection Department of the Faculty of Agriculture, Moshtohor, Benha University. Carbon dioxide and Nitrogen gases were provided as pure gas in pressure cylinders which connected with pressure regulators. The results of efficiency of Controlled atmosphere (CA) containing various CO2 concentrations (25, 50, 75 and 100%) against the various stages of Rhizopertha dominica at 30 and 20 oC showed that the efficiency of Co2 was concentration and exposure period dependent. Increasing the Co2 concentration and exposure period resulted in higher insect mortality. Also at higher temperature of 30 oC the efficacy of the various CA was higher than those at 20 oC. Also the susceptibility of the various insect stages different from one stage to another. The results indicated clearly that the efficiency of CA of 99.9% N2 was insect stage, exposure time and temperature dependent. Rising the exposure period and the temperature resulted in higher efficiency.