The pomegranate tree will grow black spots at the full fruit stage, and will fall off soon, which is mainly caused by the brown spot of pomegranate.
After the leaf is infected, it is initially dark brown small spots, and after expansion, it is nearly circular. The edge of the spot is black to dark brown, slightly convex, and the middle is grayish brown; The symptoms on the back side of the leaf are the same as those on the front side. The disease spots on the fruit are nearly round or irregular, black and slightly concave, and there are also small gray velvety particles. The outer edge of the disease spots is yellowish white after the fruit is colored.
The prevention and control measures are:
1. Strengthen cultivation management, prune reasonably, and enhance tree vigor;
2. Clean the orchard, burn or bury the fallen leaves and fruits in the orchard after falling leaves;
3. For chemical control, use 140 times Bordeaux equivalent solution or 80% ultramicro carbendazim solution and spray once at the beginning of the disease.