Myrica rubra branch rot caused losses to farmers for many reasons. The obvious symptom of Myrica rubra rot is mainly the underground root system, which will lead to the ground root system rot and the branches and leaves wither. The order of longitudinal infection is young root, fine root and tender root. Nodules are sent back to the big root neck from the regenerated roots, and the secondary lateral infection spreads from the xylem around the nucleus pulposus to the surrounding area. Farmers need to pay attention to choosing gardens by controlling the decay of bayberry. According to the study of several surrounding fields, ELA mainly occurs in low soil areas with low soil viscosity, low organic matter content and easy water accumulation. The original vegetation in the garden was hairy round grass.

Myrica rubra rot is generally caused by root infection, which leads to ground symptoms. Myrica rubra is a plant with shallow root system, invisible main root and developed lateral root and fibrous root. However, the most suitable areas for Yangmei factory operation are rainy weather and heavy rainfall. After the rainy season, the sun is shining, warm and the temperature is high. Root growth is under severe adversity, which is prone to root rot, resulting in blocked nutrient absorption and weak growth potential. Diseases caused by pathogenic bacteria can be divided into physiological diseases and infectious diseases. Physiological diseases are related to the immunity and living environment of trees (plants), while infectious diseases are related to the number of bacteria sources and reproductive conditions. It is not feasible to prevent and treat difficult diseases only by symptoms, especially sterilization, which often causes huge losses.

Only by renewing trees (plants), enhancing stress resistance, solving bacterial infection routes, and supplementing sterilization based on physiological health, the damaged parts are brown or dark brown, and some young trees have longitudinal cracks in their bark and obvious root damage. After root cutting, the root tissue turns black and brown, and the disease is severe from September to March to April of the following year. Symptoms mainly appear in late summer and early autumn. Generally speaking, loose leaves first wither from the crown, and then enter the holes from the top, peripheral branches and internal branches to varying degrees.

The symptoms eased in the following spring, even if the heading and fruiting were normal, but the symptoms were more serious in autumn. Repeat for two years, the roots wither and the plants die. In the late stage of Myrica rubra in Prague, many small black particles were produced on the surface of the lesion. They are needle disks, which are buried under the epidermis at first and destroy the epidermis when they mature. When the condition is serious, the lesion can touch the xylem. When the disease spreads to Maura's heart for a week, Maura will die.