Carbon dioxide gas production in maize, mixed with 0, 5 or 10% broken corn and foreign material(BCEM) and 0 or 100 adult maize weevils at 13, 16 or 19% moisture content(mc) was studied in 1.8 liter thermos containers which were held at 26.6$^{circ}C$ and 60$pm$5% r.h. for 80 days. $CO_2$ was measured at 7 day intervals using an infrared gas analyzer. At 13 or 16% mc, higher $CO_2$production was measured in infested maize than in uninfested maize, and BCFM did not significantly affect $CO_2$production. At 19% mc, $CO_2$production. At 19% mc, $CO_2$production was greatly increased regardless of the presence of insects and BCFM. $CO_2$produced over 12 weeks was 110-166g/kg. The number of live maige weevils after 80 days was 538 in 13% mc, 344 in 16% mc and 48 in the 19% mc Therefore, respiration of fungi such as Aspergillus glaucus, Aspergillus candidus and Aspergillus terreus other than that of insects appeared to more greatly influence $CO_2$production than did th insects at 19% mc The moisture content and presence of maize weevils were major factors affecting respiration during storage, but level of BCFM did not significantly affect $CO_2$production. The $CO_2$produced over 12 weeks was 135-17 g/kg in infested miaze at 13% and 136-144 g/kg at 16% mc.