The distribution of this disease and insect pest is very wide, involving the whole country. It is mainly harmful to the leaves of Chinese toon and can infect the branches when it is serious. After the disease, there will be yellow and white spots on the leaves of Chinese toon, and may also appear symptoms such as branch deformation, which has a very adverse impact on the development of tree crown and tree growth.
When this happens, the damaged branches and leaves should be removed immediately. Strengthen the management of Chinese toon, don't forget to apply fertilizer can also spray a certain amount of medicine to play a preventive role.
The disease is most likely to occur in young trees and has a high incidence. In the early stage of infection, there will be some small black particles on the branches, and the epidermis of the branches will turn brown. In the late stage of the disease, the branches will gradually wither, and the sunny side will be damaged.
After infection, the branches should be cut and destroyed. In winter and spring, the trunk of Chinese toon should be painted white. You can also apply Bordeaux solution to the wound for pruning.
This disease is common in areas with high yield of Chinese toon. After the disease, the growth rate of Chinese toon slows down and the leaves show signs of falling off. There is a threat of infection all year round, and it is more likely to occur in autumn due to the dry climate. In the early stage of the disease, there will be yellow spots on the leaves and protuberances on the back of the leaves. When the protuberances break, they will produce black winter spores, which will cause the leaves to turn yellow and fall off.
In winter to timely clean leaves, reduce the accumulation of infectious bacteria can also be used to prevent
