2. Soil pesticides within the range of 1.5m at the bottom of the tree pit, spraying 50 grams of chlorpyrifos or phorate granules per square meter, shallow turning the soil to a depth of 20cm, and watering in time to kill the adults near the roots.
3. Except in rainy season, the whole tree should be sprayed with long-acting drugs from April to the end of 10. The interval shall not exceed 20 days, and the spraying frequency shall not be less than 9 times a year. Drugs include chlorpyrifos and high chlorine. The concentration used is 800 times.
4. The physical barrier of "pesticide-mud composite hydrosol" is avoided when the bark beetle is used to lay eggs for trees with existing protection measures. This method can not only prevent the adults in the damaged plants from coming out of the tree and killing them, but also effectively prevent the damage of exotic bark beetles to healthy plants. In view of the irregular flight time of adults, this method has a long time limit and is proved to be effective in practice.