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Ozone toxicity during ontogeny of 2 species of flour beetles tribolium confusum and tribolium castaneum



Ozone toxicity during ontogeny of 2 species of flour beetles tribolium confusum and tribolium castaneum



Environmental Entomology 9(1): 16-17



Studies of 2 spp. of flour beetles, T. confusum (du Val) and T. castaneum (Herbst), were conducted to determine the toxicity of ozone [a potential control agent] given at specific life cycle stages. Toxicity was measured in terms of adult survival 1 mo. posteclosion. Results indicated that the younger larval and pupal stages of T. castaneum were more ozone sensitive than similar older stages; 28 day old pupae were the most ozone resistant of the stages tested. For a given stage, the younger forms of T. confusum were more ozone sensitive than older ones. Ozone resistance of T. confusum progressively increased with age, except the resistance of 20 day old larvae was comparable to that of adults. All stages of T. castaneum were more ozone sensitive than those of T. confusum; however, for both species the 15 day old larvae were equally sensitive at each exposure, as were the 28 day pupal stages. The hours of ozone exposure for 100% lethality of 15, 20, 23, 28 day old forms and adults (T. confusum:T. castaneum) were 3.5:3.5; 6.5:5.5; 5.5:3.5; 6:6; and 6.5:5, respectively.

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