Studies on Resistance to Malathion in the Mosquito, Culex tarsalis

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Abstract
A colony of Culex tarsalis Coq., 60 times resistant to malathion was found to be resistant to malaoxon (S-[l,2-bis(ethoxycarbonyl) ethyl] O,O-dimethyl phosphorothiolate), and the diethyl homolog of malathion (S-(l,2-bis(ethoxycarbonyl)ethyl] O,O-diethyl phosphorodithioate), although to a lesser degree. Slight resistance to Co-Ral® (O-(3-chloro-4-methylumbelliferone) O,O-diethyl phosphorothioate) was also observed, but no resistance was found to any other of a series of 14 organophosphorus insecticides. Two- to threefold resistance to DDT and dieldrin was also found. Larvae of the resistant and a susceptible colony degraded malathion at about the same rate and in the same manner, largely through the formation of carboxylic acid derivatives.

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