Resistance Spectra and Allelism of Chlorpyrifos Resistance Factors in Culex quinquefasciatus Populations From Colombo and Dar-es-Salaam

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Abstract
The induction of resistance in the urban pest mosquito, C. quinquefasciatus (Say), to chlorpyrifos and chlorfenvinphos and the cross-resistance spectra of these selected lines to propoxur and a number of organophosphate insecticides were studied. Distinct genetic factors governing intermediate (R1) and high (R2) levels of larval resistance to organophosphates were allelic according to the single locus, multiple allele hypothesis. Adults were less susceptible to malathion and fenitrothion after larval selection with chlorpyrifos, but the degree of resistance was much less than that in the larvae. The implications of these results for the control of C. quinquefasciatus in Dar-es-Salaam, Tanzania, is discussed.