The interactive effects on the development, survivorship and reproduction of Liposcelis bostrychophila Badonnel, of two biologically relevant controlled atmosphere (CA) environments 10% CO2+5% O2, and 12%CO2+9% O2, were determined at eight constant temperatures (17.5, 20, 22.5, 25, 27.5, 30, 32.5 and 35℃) in the laboratory. The life cycle parameters measured under nonmodified atmosphere conditions served as a control. A population reared at 17.5℃ failed either to develop or to reproduce regardless of atmospheric conditions, whereas populations reared under combined conditions successfully completed their life cycles. However, development, survivorship, and reproduction were all inhibited by hypoxia and hypercarbia compared with the control atmosphere. Egg development was more sensitive to 12% CO2 than to 10% CO2 exposure. Nymphal development, survivorship, and reproduction were more sensitive to 5% O2 (10% CO2) than 9% O2 (12% CO2). Sensitivity was evident at higher temperatures. The first and second nymphal instars were the most sensitive life stages to CA exposure. We conclude that 10±12% CO2 and 5±9% O2 atmospheres found in sealed storage containers as the result of respiration of the grain, insect and related organisms, would not be effective in the control of L. bostrychophila.