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Esterases A5‐B5 in organophosphate‐resistant Culex pipiens from Italy

Abstract. Culex pipiens mosquitoes from Lignano city, Udine province, northeast Italy, were found to carry over‐produced non‐specific esterases Al, A2‐B2 and A4‐B4 or A5‐B5, detected by starch gel electrophoresis, giving multiple resistance to organophosphorus insecticides. In order to differentiate between A4‐B4 and A5‐B5 esterases, the latter known only from Cyprus whereas the former is widespread in Italy and elsewhere, restriction fragment length polymorphism (RFLP) analysis was performed at the esterase B locus. Both B4 and B5 haplotypes were found. This is the first record of A5‐B5 esterase‐mediated resistance in continental Europe.