A Study on Resistance of Three Kinds of Cockroaches to Four Insecticides in Zhejiang Province

Objective To determine the sensitivity of Blattela germanica, Periplaneta fuliginosa and Periplaneta americana to four common insecticides, to collect basic data about their insecticide resistance, and to give guidance to apply insecticides rationally and scientifically.Methods The method of cortacting with chemical in jar was used.Results The resistance index of Blattella germanica to deltamethrin, cypermethrin, high effect cypermethrin and permethrin was respectively 1.63- 2.49 , 2.26- 3.39 , 2.22- 3.20 and 2.91- 3.76 ; For P.fuliginosa , 1.33- 2.02 , 1.30- 3.23 , 1.48- 2.65 and 1.95- 2.68 ; For P.americana , 1.49- 1.50 , 1.49- 1.74 , 1.52- 2.20 and 2.16- 2.57 respectively. Conclusion Blattella germanica has developed resistance to the insecticides mentioned above, while P.fuliginosa and P.americana has developed lower resistance.