1. Artificial prevention and control, winter and spring seasons, can be combined with fruit tree pruning and orchard management, the use of smashing, chiseling, scraping and other methods, the need to prune the insect leaves, and then burn them. Eliminate the bark between the cracks or branches at the egg masses, or use the trunk white, with lime slurry or stone sulfur composite coated dry, from the ground to the trunk of 1.5 meters to brush white to eliminate the egg masses. Walnut trees like temperature, suitable for growth in a warm and ventilated environment, during the maintenance period, appropriate pruning of branches and leaves to enhance the ventilation of the branches. During the maintenance period, the walnut tree can be given sufficient light and water and fertilizer, which can improve the disease resistance of the walnut tree. Walnut tree after spraying, the later need to strengthen the maintenance, to moderate watering, can give the walnut tree enough light, but to avoid strong light.
2. Physical control using black light baiting, late July to September, light moth baiting, baiting the newly hatched adults, by reducing the egg laying and controlling the occurrence of pests in the following year.
3. Chemical control, according to the 3-year-old larvae resistance is weak and the characteristics of the cluster early prevention and control, the population density of large, 3-year-old larvae after more serious damage to the local area should be taken immediately to chemical control, with 48% chlorpyrifos emulsion 1000-1500 times, 50% phoxim 1000 times, 2.5% high efficiency chlorpyrifos emulsion 2000-3000 times spray or 4.5% chlorpyrifos emulsion 2000-3000 times spray or 4.5% chlorpyrifos emulsion 2000-3000 times. or 4.5% cypermethrin 2,000 times spray to eliminate the larvae. In the higher depression forest area, smoke can be applied.
If the leaves of the walnut tree as well as being chewed by pests, after dealing with the insect leaves, you can spray the walnut tree with insecticidal agents such as oxidized lecithin or antifungal forest. To control the concentration of the agent, otherwise the concentration is too high, will make the walnut tree get drug damage.
In order to avoid pests nibbling the leaves of walnut trees, during the maintenance period, you can give the walnut tree spraying carbendazim, chlorothalonil or metribuzin and other fungicidal agents. The agent can be sprayed 1 time in about 20 days, and continuous spraying of the agent can effectively prevent pests and diseases. Pharmaceuticals should be used consistently, do not stop in the middle, otherwise it will reduce the effectiveness of the drug.
Through the above methods can effectively control the degree of pests, so that the walnut tree can grow normally.