In early summer, the incidence of pests is high, and common apple tree species include hawthorn leafhoppers, fruit pods, and apple claw worms. Prevention should be strengthened.

Harmful symptoms (1) Hawthorn leafhopper. The main damage leaves, buds and young fruit. Pests clustered on the back of the leaves harm, spinning knots, white spots on the front of the leaves. In severe cases, the back of the leaves was rust-colored, dehydrated and hardened, and the entire leaf was yellowish-brown and charred, resembling a fire. In the orchard with severe victimization, most of the leaves fell from June to July, and secondary flowering and sprouting occurred. The severely damaged buds could not continue to grow and die. (2) Fruit Taiwanese. Mainly in the front of the blade suction juice hazards, the formation of large chlorotic spots, resulting in leaves coke, early fall, leaves no rust on the back of the spot, do not spine netting, the victim petiole, branches, etc. attached to a large number of white molting. (3) Apple Claw. The damage of buds often fails to grow leaves and even buds die. The front surface of the affected leaves is covered with yellow-white spots. Finally, the whole leaves are yellow, and generally the leaves are not picked up or spun.

The law of occurrence (1) Hawthorn leaves. 6 to 10 generations a year, the fertilized females in the bark cracks, rough skin and the ground in the winter, after the middle and late June in the high temperature and dry conditions breed quickly, in July to enter the stage of serious harm. From late July to early August, with the arrival of the rainy season and an increase in natural enemies, the density of worms gradually decreased. Most females entered wintering sites in mid-August. (2) Fruit Taiwanese. Occurrence of 3 to 7 generations a year occurs when the egg is overwintering on the main branches and the side of the side branches and on fruit trees, etc. The apple trees begin to hatch at the time of germination in April of the next year, and the damage is most severe from the middle of June to the beginning of July. (3) Apple Claw. 6 to 9 generations a year, the eggs overwintered on fruit pedicles, fruit scars and biennial twigs, and were heavy under high temperature and dry conditions.

Prevention and control measures According to the law of occurrence of pests, the three critical periods before apple flowering, flowering, and wheat harvesting were used to control the spraying of pesticides. At the same time, attention was paid to the prevention and control of the pests to suppress the amount of overwintering insects. In the high-incidence period before wheat harvest, it can be controlled by spraying 20% ​​Ke Ling WP 600 to 800 times or 20% Fenpropathrin EC 3000x.

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