Abstract: The aim of this study was to control the young larvae of Atrijuglous hetaohei in the walnut fruits. A high pressure injector was used to inject systemical insecticides into the tree trunk and the insecticides were transported to the fruits by the tree fluids. Based on the dynamics of insecticides in thefruits, its effective period and the peak of adult emergence, the best timefor application and the proper dose of insecticides were decided. Once a yearto use this method, a mortality over 80% could be reached. This methodnot only can save time and labour but also is safe to natural enemies andenvironment, meanwhile it can not be affected by climate. No phytotoxicitieswere found and the residues were below the acceptable level.

Key words: Atrijuglous hetaonei Yang, High-pressure injecting, Control of young larvae