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1 December 2008 Dynamics of Esterase Alleles in Culex pipiens Complex Mosquitoes in Beijing
Shuaiguo Yan, Zhonghua Wu, Feng Cui, Qiao Zhao, Chuanling Qiao
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Abstract

To investigate insecticide resistance levels and dynamic changes of carboxylesterase polymorphism with time in resistant populations of mosquitoes in the Culex pipiens complex, four field populations were collected in September 2006. The resistance levels of fourth-instar larvae to organophosphate (dichlorvos, parathion, and chlorpyrifos), carbamate (fenobucarb and propoxur), and pyrethroid (permethrin and tetramethrin) insecticides were determined by bioassay. Larvae had a low but significant resistance to organophosphate and carbamate insecticides but no significant resistance to pyrethroid insecticides. Starch gel electrophoresis revealed the presence of the overproduced esterases B1, A2-B2, A8-B8, A9-B9, and A11-B11. The frequency of each overproduced esterases varied depending on its regional localities. Compared with previous surveys, the polymorphism of amplified esterase alleles in Beijing populations increased, although the resistance level to organophosphate insecticides declined.

Shuaiguo Yan, Zhonghua Wu, Feng Cui, Qiao Zhao, and Chuanling Qiao "Dynamics of Esterase Alleles in Culex pipiens Complex Mosquitoes in Beijing," Journal of Economic Entomology 101(6), 1897-1902, (1 December 2008). https://doi.org/10.1603/0022-0493-101.6.1897
Received: 21 January 2008; Accepted: 1 June 2008; Published: 1 December 2008
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