Abstract: In order to screen a suitable control agent for Stephanitis chinensis Drake, a comparative experiment was carried out between the biological pesticide Juege adding additive Kuaikeli and the chemical pesticide bifenthrin EC. The control efficiency of 1,3 and 7 days after treatments which were 500 time diluent of Juege +300 times diluent of Kuaikeli, 300 time diluent of Juege+300 times diluent of Kuaikeli,200 time diluent of Juege +300 times diluent of Kuaikeli, 300 times diluent of 10% bifenthrin EC were 39.1%,46.2%,48.3%,67.8%,81.6%,96.1%,97.4%,86.2%,85.3%,97.3%,97.8%,79.1%,respectively. There was no significant difference in the control effects between the 300 time diluent of Juege+300 times diluent of Kuaikeli and 200 time diluent of Juege +300 times diluent of Kuaikeli, but they are significantly higher than 500 time?diluent of Juege +300 times diluent of Kuaikeli and 300 times diluent of 10% bifenthrin EC. Considering the control effect and the cost of control agent, it is recommended to use 300 time diluent of Juege+300 times diluent of Kuaikeli uniform spray to control Stephanitis chinensis Drake.

Key words: Stephanitis chinensis Drake, biopesticide, Juege, pharmacodynamic test