Pear mites mainly harm leaves, buds, flower buds, fruits and shoots. The leaves of the damaged leaves are twisted, the leaves are shrunk, and the spots are formed, gradually becoming black, and causing the leaves to fall. The secretion of a large amount of mucus causes leaf adhesion, and induces bituminous coal disease, polluting leaves and fruits, which not only affects photosynthesis, but also affects the yield of pear trees, resulting in a decrease in fruit quality and commodity value.
First, the occurrence of the law: pear wood scorpion occurs 3-6 generations a year, generally winter insects in the leaves, weeds, soil and stone gaps and bark gaps overwinter. In the early spring of 2-3 months, the eggs are laid on the branches and leaves, and the nymphs are directly endangered from June to July. The nymphs secrete a large amount of glue to cause bacteria, which cause mildew, which causes brown spots and necrosis.
Second, the prevention and treatment methods: 1, thoroughly remove the litter of weeds in the pear tree, scrape out the old bark, cold winter water, to eliminate wintering adults. 2. In the middle of March, the wintering adult larvae spray 5% cyhalothrin 1000-2000 times liquid or 2.5% deltamethrin 2500 times liquid to control the adult worm base. 3, about 95% of pears fall, that is, the first generation of nymphs are more concentrated in the hatching period is the most critical period of prevention and control of pear hibiscus. Use 10% imidacloprid 4000-6000 times solution + 3.2% avermectin 5000-8000 times solution and other agents. If it is serious, add silicone and other additives on the basis of the above agents and concentrations. After manually removing the tips in April and June, spray 50 times of liquid quicklime + 20% amitraz emulsion immediately. At each time, the application is sprayed twice, at intervals of 7 days, which can be basically controlled. 5, biological control: protection and use of natural enemies, the natural enemies of pear hibiscus have flower buds, ladybugs, grass mites, parasitic wasps, with parasitic wasps control the largest, up to 50%. Mint intercropping also has a controlling effect on pear hibiscus.
LED Emergency Light Remote Head
Led Emergency Light Remote Head ,Emergency Light Remote Head ,Emergency Exit Light With Remote Head,Led Remote Head Emergency Light
NINGBO JIMING ELECTRIC APPLIANCE CO., LTD. , https://www.jimingemergencylight.com