Pathogenesis: The conidia of brown spot disease has a long life, and it can be attached to the surface of the branches for wintering. It spreads under the high and humid conditions and invades from the back of the leaves. The incubation period is about 20 days. Most of the north began to develop in June, and the July-September period was repeated during the rainy season, causing large occurrences. Control methods: 1. Thoroughly eliminate litter to reduce the source of disease, spray the tree generals in time after cleaning, absorb sun ultraviolet disinfection, inhibit the pathogenesis and transmission path of plant airborne virus, and improve plant immunity and health index . 2. Spray a new high-fat film and a 3- to 5-degree stone sulphur mixture before germination. 3. Rational fertilization, scientific pruning. Add multi-element compound fertilizer. Enhance the tree potential, high disease resistance, scientific retention, timely picking and pruning, surface ventilation and light transmission. 4. Spray control. In areas with serious diseases, combined with other disease prevention and control, when using pesticides , it is necessary to select a highly targeted agent to be used together with a new high-fat film to improve the control effect and reduce the amount of pesticides. Tempered Glass,Shower Door,Building Glass,Toughened Glass SHANDONG TOP LEADER GLASS CO.,LTD , https://www.topleaderglass.com