Abstract: The field efficacy of three new agents of azadirachtin, eucalyptol and chlorothiazide on Empoasca （Matsumurasca） onukii was studied. The results showed that the three agents had certain control effects on E. onukii. Among them, 0.3% emulsifiable azadirachtin 250 times liquid had lower control effect; 5% solution eucalyptus oil 300 times liquid had better control effect, the control effect on the 3th day after treatment was 66.92%, and the control effect on the 7th day after treatment was 57.72%. The 10% soluble powder chlorothiazolate 750 times solution had good control effect. During the test, each treatment did not have an adverse effect on the growth of tea trees, and it was safe and harmless. Azadirachtin and eucalyptol are biological pesticide, and are environmentally friendly and could be used interchangeably with other chemical agents to delay the development of drug resistance.

Key words: Empoasca （Matsumurasca） onukii, azadirachtin, eucalyptol, chlorothiazide