An Increase in the Duration of the Life Cycle of DDT-Resistant Strains of the House Fly

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Abstract
The larval periods of 4 DDT-resistant strains of Musca domestica were significantly longer than those of a nonresistant strain. DDT-resistant flies from larvae which pupated the first 48 hrs. were less resistant than flies from larvae which pupated the last 48 hrs. in a given larval population. No significant differences between a highly DDT-resistant strain and a non-resistant were found in the no. of eggs laid, length of egg stage, % hatching, length of pupal stage, pupal weights, sex ratio, pre-oviposition period, or length of adult stage.

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