Investigation on resistance level of Blattella germanica to 9 commonly used insecticides in Lu'an City in 2023
HOU Yinxu
SHI Yong
HOU Haoyu
RUI Zhenyu
TAI Deyun
MA Chao
WU Lei
XU Qinghua
Abstract：Objective In order to further understand the resistance level of Blattella germanica to 9 commonly used insecticides in Lu'an city,so as to provide data support for the rational selection of insecticides for indoor cockroach control and resistance management.Methods From April to October 2023,the wild population of B.germanica was collected from guesthouses,restaurants,farmers'markets,supermarkets and other habitats in the main urban area of Lu'an City,and the resistance of B.germanica to 9 commonly used insecticides was determined using the residual film method.The experimental data were processed and analyzed by Excel V2024 and SPSS 23.0 software.Results The 24 h mortality rates of B.Germanica treated with deltamethrin,tetramethrin,cypermethrin,alphamethrin,beta-cypermethrin,propoxur,diphos,chlorpyrifos and dichlorvos in Lu'an City were 100.00％,55.07％,92.22％,94.29％,100.00％,100.00％,92.50％,88.33％and 53.33％,respectively.The median knockdown times(KT50)were 23.38,97.61,67.71,22.37,15.83,23.05,99.77,35.01 and 22.37 min,respectively.According to the resistance criteria of mortality,the wild population of B.Germanica in Lu'an City was resistant to permethrin and dichlorvos,likely resistant to cypermethrin,alphamethrin,bisphos and chlorpyrifos,and sensitive to deltamethrin,beta-cypermethrin and propoxur.According to the resistance criteria of knockout,the resistance to alphamethrin,beta-cypermethrin,propoxur and chlorpyrifos was low,and the resistance ratios were 4.69,3.69,1.78 and 1.29,respectively;moderate resistance to deltamethrin,dithiophos and dichlorvos,with resistance ratios of 5.98,6.55 and 5.80,respectively;high resistance to permethrin and cypermethrin,with resistance ratios of 28.13 and 15.35,respectively.Conclusion The wild population of B.Germanica in the built-up area of Lu'an City has developed different levels of resistance to 9 commonly used insecticides at present.In the future chemical control of cockroaches,resistance monitoring should be strengthened,and the production and use of sanitary insecticides should be scientifically managed according to the guidance of data,so as to delay and control the further development of resistance.
Keywords：Lu'anBlattella germanicainsecticidesresistanceresidual film method
Publication Date：2024-12-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 521-523,533 )