Experiment on Pesticide Control of Psylla pyrisuga

[Objective] The purpose was to seek for pesticide with high efficiency and low toxicity for controlling Psylla pyrisuga.[Method] The occurrence law and damage condition of P.pyrisuga were observed and the pesticide control experiments in laboratory and field were conducted.[Result] In Suzhou area,P.pyrisuga had 6 generations a year and its full hatching rate of egg was full-bloom stage of pear and its occurrence had close relationship with temperature and rainfall.The field efficacies of imidacloprid,avermectin and 3% acetaniprid EC diluted 2 000 times were very good and their killing rates on P.pyrisuga adult after 30 d were also over 95.0%.The field efficacies of imidacloprid,avermectin,3% acetaniprid EC diluted 2 000 times and sumicidin diluted 1 000 times were very good and their killing rates on egg were over 94.0%.The efficacies in laboratory of bromadiolone EC diluted 600 times and Jiadeshi Disichong diluted 200 times were better,their killing rates on P.pyrisuga laver reached over 95.0% and their field efficacy was equal to that of imidacloprid and sumicidin.[Conclusion] The first choices were imidacloprid,avermectin and 3% acetaniprid in the occurrence period of P.pyrisuga adult and bromadiolone EC and Jiadeshi Disichong in the occurrence period of its laver.