The walnut tree leaf-feeding pests use larvae to injure young leaves, and the damaged leaves are incomplete. With the increase of larval instars, their food intake increased, they could eat the pruning leaves, leaving only the main veins, so that the damaged fruit trees could not grow normally, and the fruits were plentifully or totally detached, resulting in a large area of ​​walnuts producing less or no harvest, and aging trunks withered to death.
Control methods:
Artificial control of winter and spring seasons, can be combined with fruit tree pruning and orchard management, the use of spasm, chisel, scraping and other methods to eliminate the gap between the tree bark or branches of the egg, or use the trunk white, with lime slurry or lime sulfur dry, from the ground Brush the white eggs 1.5 meters away to eliminate the eggs.
Chemical prevention and control are based on the early 3rd instar larvae's weak resistance and clustering characteristics. For areas with high densities, 3rd instar larvae, and severe damage, chemical control should be taken immediately, with 48% chlorpyrifos EC 1000- 1500 times, 50% phoxim 1000 times, 2.5% lambda-cyhalothrin EC 2000-3000 sprays or 4.5% cypermethrin EC 2000 times spray to eliminate larvae. In areas with high canopy closures, smoke can be applied.
Physical control From the late July to the end of September, the light moths were trapped to trap newly hatched adults and control the occurrence of pests in the following year by reducing spawning.
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