How to control mites in apple trees in summer?

How to control mites in apple trees in summer? Please introduce the harm of apple tree mites in summer: first, harm symptoms 1. Hawthorn spider mite. Also known as Hawthorn red spider, it mainly harms the leaves, buds and young fruits of apple trees. When the leaves are damaged, the red spiders live in groups on the back of the leaves, spinning and drawing the net, adhering to fine soil particles and eggs on the screen, and many pale spots appear on the front of the leaves. When the damage is serious, the back of the leaf appears rust color symptoms, and then dehydration and hardening, the whole leaf becomes yellowish brown and scorched, similar to burning. In the seriously damaged orchards, most of the leaves could fall off from June to July, and the second flowering and germination appeared, and the seriously damaged buds could not continue to grow and die. two。 Tetranychus guotai. Fruit mite, also known as apple long-legged red spider and alfalfa red spider, is mainly harmful to the front of the host leaf and can form large chlorotic spots, and there is no rust on the back of the leaf. This kind of red spider does not spin silk to pull the net, the damaged petiole, branches and other places with a large number of white mite skin, can cause leaf scorch, early fall. 3. Tetranychus panonychus. Also known as apple red spider, bud damage often can not normally spread leaves and blossom, or even whole bud death, the injured leaves are covered with yellow and white spots on the front, and finally the whole leaves are withered and yellow, generally do not fall leaves early, nor pull silk to form a net. Second, the law of occurrence 1. Hawthorn spider mite. It occurs 6-10 generations a year, and the fertilized female overwinters in the bark cracks, under the rough bark and in the soil crevices on the ground. generally, the harm is mild before June, and it propagates rapidly in the high temperature and dry climate after the middle and late June, and enters the serious harm stage in July. It can cause a lot of fallen leaves. From late July to early August, with the arrival of the rainy season and the increase of natural enemies, the population density decreased gradually. by the middle of August, most females had entered the overwintering place, and some could survive the winter from September to October. two。 Tetranychus guotai. There are 3-7 generations a year, and the eggs overwinter in the shade and fruit platform of the main branches and lateral branches, and begin to hatch when the apples germinate in April of the following year. The damage is the most serious from mid-June to early July, and eggs usually appear in early August. 3. Tetranychus panonychus. There are 6 to 9 generations a year, and the eggs are overwintered on the fruit platform, fruit marks and biennial twigs. High temperature drying is beneficial to the reproductive harm of Tetranychus panonychus in apple trees. Third, control measures to control mites pests, except on the basis of dormant period control and pest situation prediction, according to the occurrence law of red spiders, grasp the three key periods before and after apple flowering and wheat harvest, spray at the right time, and pay attention to late control, in order to keep the overwintering insect population down, the harm of red spiders can be effectively controlled. At present, it is the high incidence period in the early stage of wheat harvest, so we should choose 25% of the solution of 600 × 800 and 20% of EC 3000 times for prevention and control. In addition, there are many natural enemies of three species of red spiders, including natural enemies, predatory mites and pathogenic microorganisms, which should be protected and utilized in production. Click to get more apple tree planting techniques click to get more fruit planting techniques