It's a tree tumor. It can be divided into traumatic type and bacterial infection type. As the name implies, the external force injury type is that after the trees are physically injured, the sieve tube breaks, resulting in local overnutrition, which leads to disorderly cell division and tumor-like tissue.

External damage sometimes includes damage caused by pests and diseases, such as the eating of longicorn beetles. Because of the diversity of bacterial species, the type of bacterial infection is usually called tumor bacterial infection.

Extended data:

Evergreen trees of Sabina of Cupressaceae, with pointed or conical crowns and oval-shaped ancient trees. Leaf type 2. Young trees or sprouting branches at the base are mostly triangular, like light and shade, and the soil selection is not strict, requiring deep, fertile, slightly wet and well-drained soil.

In the south of the Yangtze River, it does not spread outward, but turns up around the trunk, and the lateral branches are closely arranged. The whole tree is Wan Ru Shuanglong, and the lower branches should be properly preserved, and cannot be cut off or damaged at will, otherwise hanging seedlings will be formed. After shaping and pruning, it is flat and round, which can show its low fullness, detail and fineness.