Symptom: this disease is also called resinous disease. It mainly occurs in the trunk and branches of trees. At the beginning of the disease, the trunk is swollen, and then the light yellow resin flows out. After that, the resin will gradually turn into red brown, and then the color will turn into brown. When the weather is dry, these will turn into hard crystals.
Prevention and control: strengthen management and improve soil condition before occurrence. We should also combine pruning to cut off the diseased part in time. In addition, the trunk should be whitewashed twice in winter and summer, which can effectively prevent the occurrence of gummosis.
Symptoms: the main site of this disease is at the root, which causes the root to grow abnormally and hinders the absorption function.
Prevention and control: the root nodules should be removed in time, then the soil should be disinfected, and the microorganism such as charcoal powder should be used to improve the soil.
Aphids, scale insects, red spiders and so on are all pests. Adults will stab into the tree, then suck the sap inside, causing the growth of the tree to weaken.
Prevention and control: the main treatment for insect pests is prevention. It needs to spray 3-4 times a year. The first time is before the flowers open, the next time is after the flowers wither, and the third time can be from July to August.
