Abstract
The rate of adsorption of DDT from residues on glass surfaces and its absorption and conversion to DDE (1,1-dichloro-2,2- bis(p-chlorophenyl)ethylene) was evaluated in a normal colony and three resistant colonies of house flies (Musca domestica L.). External DDT increased with the time of exposure and with fly activity in two of three colonies. Different colonies of flies picked up DDT at different rates. Detoxification of DDT to DDE increased with time of exposure. Knocked-down flies showed more absorbed DDT than those still up at the end of the exposure period, and less conversion of DDT to DDE. Susceptible flies showed the presence of a DDT-DDE detoxifying mechanism after prolonged exposure to DDT residues, and a colony selected with malathion converted DDT to DDE in short exposures.
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