The main diseases of Sophora japonica are powdery mildew, ulcer disease and rot disease. You can choose to use 70% thiophanate methyl wettable powder 800~1000 times liquid or 50% Debacter special wettable powder 600~800 times liquid spray to control; the main pests are: Sophora aphid, Sophora japonicus, armyworm, American white moth, etc., you can choose 10% imidacloprid wettable powder N2000 times liquid and 4.5% lambda cypermethrin EC 1500 times liquid or 2.0% N vermectin EC 3000~4000 times liquid compound Carry out prevention and control; the weeding of the national locust nursery is mainly in the seedling land of the year. Manual removal or chemical herbicide control can be adopted. When chemical herbicides are used for control, be careful not to spray the agent on the trunk.