Insecticide Resistance of Culex tritaeniorhynchus in Yibin from 2023 to 2024
TAN Qixiang
ZHOU Ping
LI Jiaqi
XIAO Quanquan
ZHANG Heng
XIE Yan
Abstract：Objective To investigate the resistance of Culex tritaeniorhynchus to commonly used insecticides in Yibin,so as to provide a scientific basis for scientific use of insecticide.Methods The larval immersion method and adult contact tube method were employed to determine the resistance levels of mosquitoes to different insecticides.Results The resistance ratios of Cx.tritaeniorhynchus larvae to deltamethrin,permethrin,propoxur,and malathion were from 5.00 to 1 051.20,with resistance levels classified as low,moderate,high,and high,respectively.The LC50 values for chlorpyrifos and imidacloprid were 0.426 mg/L and 0.632 mg/L,respectively.Adult mosquitoes demonstrated varying degrees of resistance to different insecticides,with mortality rates ranging from 0 to 51.85%.Conclusion Cx.tritaeniorhynchus has developed multi-insecticide resistance in Yibin.It is recommended to establish an effective insecticide regulatory system and a rotation mechanism,as well as to promote the scientific and rational use of insecticides to delay the development of resistance.
Keywords：Culex tritaeniorhynchusinsecticide resistanceinsecticides
Publication Date：2025-12-20
Online Publishing Date：2026-01-09(First online date of this platform, not the publication date of the document)
Pages：3( 756-758 )