Filariasis vector in China: insecticide resistance and population structure of mosquito Culex pipiens complex.
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).
Cui
Feng
F
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Graduate School, Chinese Academy of Sciences, Beijing 100080, China.
Tan
Yi
Y
Qiao
Chuan-Ling
CL
D025041:Animal Migration; D000818:Animals; D002681:China; D003465:Culex / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D004950:Esterases / Q000235:genetics; D005368:Filariasis / Q000635:transmission*; D005838:Genotype; D006801:Humans; D007303:Insect Vectors / Q000187:drug effects*; D007305:Insecticide Resistance / Q000235:genetics; D007306:Insecticides / Q000737:chemistry / Q000145:classification; D007814:Larva / Q000187:drug effects
D007306:Insecticides; D004950:Esterases