Abstract
Abstract Toxicelogical assays for resistance in sympatric populations of Culex tarsalis, Culex pipiens quinquefasciatus, and Culiseta inornata in the Coachella Valley of California revealed high level; of resistance in larvae and adults of C. tarsalis toward most organophosphorus insecticides tested but absence of resistance toward carbamates. C. p. quinquefasciatus and Cs. inornata were generally susceptible to the insecticides tested except DDT and dieldrin. Differences in the distribution of the 3 species in time and space were found to be important determinants cf resistance in the populations.
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