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Insensitive acetylcholinesterase (AceR) and five over-produced esterases (A1, A2 and B2, and A4 and B4) involved in detoxification are responsible for resistance to organophosphorous insecticides (OPs) in Culex pipiens L. from the Rhône-Alpes region, where C. pipiens control is mainly accomplished with the OPs temephos and chlorpyrifos using 0.15 mg/liter(More)
Ecotypic differentiation is well described in the mosquito Culex pipiens, separating populations breeding in subterranean and human-made sites (hypogeous habitat) from those in open-air sites (epigeous habitat). The pattern of population differentiation observed at the Aat-1 locus has been suspected to be associated with such ecotypic differentiation via(More)
A monthly survey of resistance gene frequencies was conducted in a larval population of Culex pipiens breeding in an hypogeous site ("molestus" form) between July 1989 and September 1991, after interrupting mosquito control. Several significant variations in resistance gene frequency were observed. Some variations are explained by fitness differences(More)
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