Removal and prevention methods: strengthen ventilation and light transmission, and pay attention to controlling environmental humidity. If a small number of live insects are found, wipe them off with a wet cloth or stick them off with transparent tape. For productive cultivation, 25% chlorpyrifos wettable powder 1500 times can be sprayed at the peak of nymph hatching.
Scale insects harm leaves, branches and fruits. Scale insects are often male, have wings and can fly. Once female insects and larvae emerge, they feed on branches and leaves or fruits all their lives, resulting in yellowing of leaves, withering of branches and leaves, and decline of tree potential, which is easy to induce soot disease.
Scale insects have strong reproductive ability and occur for many generations a year. Eggs hatch into nymphs, and after a short period of crawling, they live a fixed life, that is, they form shells. Its drug resistance is strong, and it is difficult for general drugs to enter the body, so it is difficult to prevent and treat it. So, once it happens, it's hard to clean up.
The occurrence and harm of scale insects are closely related to environmental conditions. Various environmental factors have a direct impact on the growth, reproduction, longevity and population growth and decline of scale insects. These environmental factors are usually divided into two categories: abiotic factors and biological factors. Abiotic factors include climate factors such as temperature, humidity, light, wind and rain, and biological factors mainly include host plants, natural enemies and human activities.
References:
Baidu encyclopedia-happiness tree
References:
Baidu encyclopedia-scale insects