关键词: 致倦库蚊, 有机磷, 杀虫剂抗性, 酯酶电泳

Abstract: Electrophoretic analysis of mosquitoes of Culex quinquefasciatus sampled in 1992 from Foshan, China, revealed 3 highly active esterases(EB1, EB2 and EB3). These esterases are involved in organophosphate resistance. After treatment the population by 95% lethal dose of malathion,all surviving mosquitoes possessed only EB1 phenotype,but 96% lethal dose of fenthion did not select special estcrase, 3 phenotypes were present in survivors, although the proportion of EB1 increased. The results indicate that EB1 is more efficient in providing OP resistance than EB2 and EB3,and various esterases have different selective advantage under different OP pressures.