A considerable amount of information has been obtained in recent years concerning the effects of modified or controlled atmospheres on stored-product insects. However, most laboratory studies have been carried out at temperatures ranging from 26° to 33° C. Bailey and Banks (1974), in a summary of 10 of the more recent laboratory studies, found only one that was conducted at temperatures as low as 15.6° C, and this one (Harein and Press, 1968) had to do only with adult Tribolium castaneum (Herbst). Again, when Banks (1978) summarized results of field studies with modified atmospheres, he noted only one low temperature large-scale field study (Banks et al., 1978). This was conducted at 13.5° C and 77 to 79per thousand mortality of all life stages of Sitophilus oryzae (L.) was obtained by a 10-day exposure to atmospheres containing from 47 to 68per thousand carbon dioxide (CO₂) (balance of modified atmosphere was air). Earlier Banks and Annis (1977) had suggested when a storage facility containing grain at 15° C is purged with nitrogen (N₂) for insect control, the exposure time must be greater than 24 wk for complete disinfestation, even when the oxygen (O₂) level is held at 0-1.2. Because of lack of information on the combination of low temperature and modified atmospheres, the following study was undertaken. -- CCI