Changes in cross-resistance spectrum resulting from methyl parathion selection of Culex tarsalis Coq.


Larvae of a field strain of Culex tarsalis Coq. manifesting a broad spectrum of resistance to organophosphorus (OP) insecticides were selected further by methyl parathion pressure in the laboratory. There was a 6.9 times further increase in resistance to methyl parathion in larvae, i.e., from 13.4 times level of resistance in the parental strain to 93.5… (More)


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