Investigation on resistance of Culex pipiens pallens in Weishan Lake basin,Shandong Province in 2023
Objective To find out the resistance level of Culex pipiens pallens to 5 commonly used insecticides in Weishan Lake basin of Shandong Province,and to provide scientific guidance for rational and effective larval source management of mosquitoes.Methods From May to October 2023,Culex pipiens pallens larvae were collected from the monitoring sites in Rencheng District,Yutai County,Weishan County,Tengzhou City and Zoucheng City.The larvae mortality of Culex pipiens pallens at the end of age Ⅲ and the beginning of age Ⅳ was measured by larval immersion method.Results In 2023,resistance ratio of the larvae of Culex piens pallens to cypermethrin,deltamethrin,dichrovos and propoxur was all greater than 1.66,and the resistance to cypermethrin and deltamethrin was the highest,and they were all high resistance.The resistance to dichlorvos and propoxur was medium or low,and the resistance to Bt was low or sensitive.Conclusion In 2023,Culex pipiens pallens larvae tested in Weishan Lake basin produced different degrees of resistance to sanitary chemical insecticides.Attention should be paid to environmental remediation and the scientific and rational use of insecticides on mosquito control.
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