[Objective]To evaluate the field efficacy of five botanical insecticides to control Hlyphantria cunea and determine the optimum dosage.[Method]The control efficacy test of spray treatment on the third instar larvae of Hlyphantria cunea before its outbreak was tested in the field.[Result]The best control effect of nocotine·matrine1.2％EC at 6,8,12 mg/L was 87.83％-92.61％on the 3rd day after treatment,and which reached the peak on the 14th day,ranging from 95.85％-97.99％,1.5％matrine soluble concentrate and 0.5％pest chrysanthemum ·matrine soluble concentrate reached the peak on the 14th day after treatment,which were 84.62％-95.13％and 89.14％-91.93％,respec-tively.[Conclusion]The recommended active ingredient content of nocotine·matrine 1.2％EC is 6-12 mg/L,which has the best effect on the control of the 3rd instar larvae before its outbreak,and can be widely used.1.5％matrine soluble concentrate and 0.5％pest chrysanthemum ·matrine soluble concentrate can also be used alternately during the control,which has no adverse effect on the growth of poplar,the species and number of beneficial natural enemies.
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