Abstract: Comparative experiments on the efficacy of biological pesticides （5% eucalyptus oil solution） and conventional chemical pesticides （60 g/L ethyl doxycin suspension） against Dendrothrips minowai Priesner were conducted. The results showed that the control effects of 5% eucalyptus oil were 75.80%, 98.25%, 98.51% and 98.53% after 7 days of treatment with 750 times, 500 times, 300 times dilution of 5% eucalyptus oil and 60 g/L ethyl dotoxicillin suspension 750 times dilution, respectively. 5% eucalyptol solution 500 times diluent, 300 times diluent, and more than 60 g/L ethyl kill toxin suspending agent 750 times diluent medicine post-processing of 3, 7 d efficacy difference was not significant, but which were significantly higher than 5% eucalyptol solution 750 times diluent control effect. The solution of 5% eucalyptus oil could also control other main pests occurring in the same period of tea plantation. It had no bad effect on the normal growth of tea trees and the quality of tea leaves.

Key words: tea stick thrips（Dendrothrips minowai Priesner）, biological pesticide, organic tea garden, efficacy test