Excuse me, what happened to the rich tree? How to treat it? (The leaves are a little burnt)

From the picture, this is the leaf spot of the rich tree.

Symptoms: The disease causes leaf scorch, which is an important leaf disease. This disease affects growth and appreciation. At the beginning of the disease, brown spots appear on the leaf margin or tip, and after expansion, they are irregular dark brown. In the late stage of the disease, the focus is gray or grayish brown, and the edge of the focus is dark brown, with or without yellow focus around the focus. Severe lesions are paper-like. Under humid conditions, the disease will grow a small number of small black spots.

Cut off four serious leaves and other diseased spots.

Prevention and control: 800 times of polyene or 400 times of 30% basic copper sulfate suspension or 700 times of 75% dyclonine wettable powder. 7 days/kloc-0 times, 2-3 times in a row.