Litchi canker is commonly known as litchi pellagra. It mainly damages the trunk, ranging from defoliation to death of large branches or whole plants. Symptoms: at the beginning of the disease, the epidermis on the trunk and branches is dull, then it gradually shrinks, cracks coarsely and the cortex falls off obliquely. In severe cases, xylem will turn brown, leading to the death of branches above the affected area.

Prevention and control methods:

1, trunk wounds should be avoided as far as possible to reduce the invasion of pathogens. At the initial stage, the cortex on the diseased part should be removed in time, and in severe cases, the diseased branches should be removed and the bark and branches with germs should be burned.

2. After scratches or cuts, apply copper oxychloride slurry or sulfur mixture in time to protect the wound and promote healing. If ulceration or other pests are found, 50 kg of sulfur mixed liquid medicine can be mixed with 50 g of 90% trichlorfon and used immediately.

3. Strengthen the management of trees, enhance the disease resistance of plants, and reduce the harm of diseases.