Symptom recognition is harmful to the branches and leaves of Sophora japonica seedlings and young trees. Spindle galls are formed on the diseased branches. The bark on the tumor body is rough, longitudinally cracked, and there is dark brown powder in the crack, that is, the pathogen winter spore pile. The branches above the diseased tumor gradually died, and the galls on the trunk were similar to those on the branches. Due to the low temperature and short growth period in the northern region, the disease development of seedlings is slow after onset. After 7-8 years, the branches above the tumor did not die, but the tree vigor was obviously weak, which led to the parasitism of tree rot fungi. There is yellowish brown powder on the back of petiole and leaf, which is the summer spore pile of pathogenic bacteria.
The pathogenic bacteria with regular occurrence are fungi, including Basidiomycotina, Cordyceps sinensis, Cordyceps sinensis and Sophora japonica. The pathogen overwinters in the diseased tumor and is perennial, which harms the host for many years.