Abstract
Tribolium castaneum adults and pupae were exposed to carbon monoxide (CO) at concentrations of 20%, 30% and 40% in air, for 24, 48, 72, 96 and 120 h. The toxic effect on the treated adults was insignificant except for the longest exposure at the highest CO concentration, at which mortality values reached 11.3%. Adult emergence from the treated pupae was affected considerably, resulting in zero emergence (100% pupal mortality) at the highest dosages. Deformed adults emerged from pupae treated with 30% and 40% CO. The inhibitory effect of CO on the cytochrome P-450-dependent mono-oxygenase system or another oxidase system functioning at the pupal stage is proposed as a possible explanation for the failure of adult emergence.
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