The apple tree pays attention to the locust prevention pests in summer
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First, the harm symptoms
1. Hawthorn leaves. Also called the red spider of the mountain, it mainly damages the leaves, buds and young fruit of the apple tree. When the leaves are victimized, red spiders colonise the back of the leaves, pull silk nets, and adhere to fine soil particles and egg granules on the screen. Many pale spots appear on the front of the leaves. When the victim suffers serious damage, the symptoms of rust appear on the back of the leaf, which leads to dehydration and hardening. The whole leaf turns yellowish-brown with char, and it resembles fire. In severely affected orchards, most of the leaves can fall off between June and July, and secondary flowering and sprouting will occur. The severely damaged buds will not continue to grow and die.
2. Fruit oysters. Fruit locusts, also known as apple long-legged spider mites, and red spiders, are mainly used to inhale hazards on the surface of host leaves, and can form large spots of chlorotic rust, with no rust on the back of leaves. This red spider does not spit and pull the net, and the infected petiole, shoots, etc. are accompanied by a large amount of white molting, which can cause the leaves to dry and fall off.
3. Apple full claws. Also known as the apple red spider, the bud often suffers from failure to bloom and even buds die. The front of the victim's leaf is covered with yellow-white spots. The last part of the leaves is yellow, and generally the leaves are not picked up or drawn.
Second, the law of occurrence
1. Hawthorn leaves. 6 to 10 generations in 1 year. Fertilized females overwintered in the cracks in the barks, under the rough skin, and in the ground. Generally, the hazards were light before June. After the middle and late June, they were breeding under high-temperature and dry climate conditions. Soon, in July, it will enter a severely hazardous stage and 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 density of insect populations has gradually declined. By mid-August, most females have entered wintering sites, and some may continue to winter through September to October.
2. Fruit oysters. In 1 to 3 generations, the eggs were overwintered on the main branches and side branches of the veil and fruit vines. The hatching of the apple began in April of the following year. The damage was most severe from mid-June to early July, and the egg usually appeared in early August.
3. Apple full claws. In the 1st to 6th generations, the wintering of eggs on the fruit pedicles, fruit scars, and biennial twigs, the high-temperature drying is beneficial to the reproductive hazard of the apple tree.
III. Prevention and control measures Prevention and control of terpenoid pests, in addition to dormancy prevention and insect pest monitoring, based on the law of the occurrence of spider mites, grasping three critical periods before and after apple blossom and wheat harvest, spraying pesticides in an appropriate period. At the same time pay attention to late control, in order to reduce the overwintering worms, can effectively control the red spider's harm. At present, it is the high-incidence phase of wheat harvest that should be used 25% of the net 600 to 800 times the broom, 20% of the anti-scanning cream 3000 times the liquid for prevention and treatment. In addition, there are many natural enemies of the three kinds of red spiders, common natural enemies, predatory mites and pathogenic microorganisms, production should pay attention to protection and utilization.