Abstract: High-pressure injection machine was used to inject a kind of systemic insecticide into the walnut trunks making it transport throughout the tree for controlling the low-age larvae of Airijuglans hetachci Yang which had invaded into the fruits. Meanwhile, the Variation regularities of both the amounts of insecticide in the tree body, especially, in the pericarp and kernel of the fruits, and the number of the pest insect were also investigated . The results showed that application of insecticides by injection only once a year at the peak period of the adults obtained over 80% effectiveness without any damage to the tree. The insecticide residues in the harvested walnut were within the maximum limits for pesticide residue of UN.

Key words: Atri juglans hetachei Yang, Control of pests, High-pressure injection, Walnut