Resistance of Anopheles to 5 kinds of common used insecticides in Dalian city

Objective To investigate the resistance of adult mosquito of Anopheles to DDT,deltamethrin,propoxur,beta cypermethrin and permethrin in Dalian and provide scientific evidence for its control.Methods Anopheles were captured with filter contact method recommended by WHO and the knockdown rate,the knockdown time and 24 h mortality were observed.Results The knockdown time of the first Anopheles to DDT,deltamethrin,propoxur,beta cypermethrin,permethrin in Dalian were 6,6,4,8,8 min.Death rate of discrimination dosages:deltamethrin 91.30%,propoxur 89.48%,permethrin 84.93%,beta cypermethrin 80.43%,they were initially resistant group(M);DDT 50.60%was a resistant group(R).Conclusion Resistance should be monitored regularly.Integrated use of insecticides and other methods for control of Anopheles should be carried out according to local conditions.The occurrence and development of resistance could be prevented and reduced by scientific and rational use of insecticides.