Symptoms: soot disease is very common in flowers and trees. The main characteristics of disease in babaojingtian are dark brown mold layer or black coal powder layer on leaves and branches. It greatly affects photosynthesis of plants. In the later stage, the mould layer expanded and spread all over the whole leaf surface, causing plant death and reducing its ornamental value. High temperature and humidity, poor ventilation, aphids and other pests will aggravate the disease.
Prevention and control: babaojingtian should be planted in a reasonable dense, not too dense, and combined with appropriate pruning. It is necessary to ensure that the breeding environment is ventilated and transparent, and the humidity is prevented. In the dormancy period, it is suggested to spray 3-5 degrees of sorbide mixture to eliminate the source of overwintering disease. The occurrence of soot disease is also related to aphids and Scale Insects Damaging stems and leaves. To reduce the incidence of soot disease, measures such as spraying 1000 times of 40% Omethoate or 1500 times of 80% dichlorvos can be taken.
Symptoms: the disease is mainly caused by leaf eating insects such as Buxus chrysophalangensis and P. chrysophalangensis.
Control: spray the larvae with trichlorfon or dichlorvos 1500 times liquid during the activity period from April to May. In addition, 10-20 times turpentine mixture and petroleum emulsion can be used to control scale insects. If it's caused by parasitic bacteria, spray 500-800 times of diansen ammonium and 400 times of sterile Dan.
