Journal
PEST MANAGEMENT SCIENCE
Volume 63, Issue 5, Pages 453-458Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.1356
Keywords
culex pipiens; organophosphate; carbamate; overproduced esterases; population structure
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Seven field populations of mosquito Culex pipiens complex (Diptera: Culicidae) were collected from four provinces of China. The resistance status of larvae to dichlorvos, parathion, chlorpyrifos, fenobucarb (BPMC) and propoxur were determined by bioassays, disclosing that they were more resistant to organophosphate (moderate or low resistance) than to carbamate (low or no significant resistance) insecticides. Starch gel electrophoresis confirmed the presence and distribution of overproduced esterases B1, A2-B2, A8-B8 and A9-B9, the frequencies of which varied according to their regional origins. Electrophoretic polymorphism at four putatively neutral loci (got-1, got-2, pgi and pgm) showed that the overall genetic differentiation found across all populations was significantly large (Fst = 0.28,P < 10(-4)), and genetic exchange was slightly restricted by distance isolation (P = 0.018). (c) 2007 Society of Chemical Industry.
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