The scale insects are the most important pests injuring the chestnut trees. They adsorb on the internal branches and leaves to suck the juice, weakening the tree vigor, yellowing the leaves, and causing the branches to die. The scale insects that injure the chestnut tree are mainly blows, and winter in the branches and leaves. The temperature rises in the spring and then it reproduces in large numbers, damaging the foliage. At present, chestnuts have been harvested and are the best time to prevent and control the scale insects. At this time, the scale insects will be exterminated, and the number of overwintering will be reduced. In the spring of next year, the damage will be significantly reduced. Specific prevention methods are as follows: After chestnut trees are harvested, clear the garden in time to remove all kinds of weeds and litter and fruit around the chestnut tree, cut off dry and dry branches damaged by pests on the canopy, and bury or burn the outside of the park, and spray the canopy once. 40% cull aqueous phosphorus solution, or 1000 times 0.5% phenoxy acid aqueous solution, or 1500 times 48% chlorpyrifos solution, or 1500 times 20% aqueous thiamethoxam solution. After 15-20 days, the crown was sprayed once again with an aqueous solution of 0.8-1 Baume sulfur. Evenly spray all the branches inside and outside of the canopy to start dropping with drops of water.
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