Resistance of Blattella germanica to five kinds of insecticides

Objective To determine the resistance of Blattella germanica to five commonly used insecticides in Haidian district and provide the evidence for rational insecticides selection.Methods The resistance was examined by the method of contacting with chemical cover.Results The resistance index of field collected strains to cypermethrin,deltamethrin,propoxur,acephate and dichlorvos were 7.03,3.20,2.90,7.57 and 13.13 respectively.Conclusion The field strain in Haidian district has no significant resistance to propoxur.However,it has developed low resistance to deltamethrin and high resistance to cypermethrin,acephate and dichlorvos.