Symptoms: the leaf spot mainly occurs in summer, which will damage the leaves. The spots appear from the tip or edge of the leaves. At first, they are light brown small spots, then they become big spots, and the color is gray brown to reddish brown. Later, many small black spots will be scattered on the spots. Prevention and control: at ordinary times, strengthen the ventilation and cultivation management. In the early stage of the disease, it is necessary to spray chemicals. 1:2:100 lime multiple Bordeaux solution can be used.
