Symptoms: This disease occurs during the nodule period. In the early stages of the disease, watery spots appear on the outer leaves or the base of the leaf bulbs. The outer leaves of the plants wilted at noon and recover sooner or later. After a few days, the outer leaves no longer recover, and the diseased part begins to rot. The ball is exposed or the base of the plant gradually rots into a mud or collapse, and the tissue at the base of the leaf base or rhizome is gray-brown and soft rot, and the whole plant rots badly, and the diseased part emits an odor.
Control methods:
1. Strengthen field management. Avoid continuous cropping with solanaceae and cruciferous crops to prevent flooding and avoid man-made wounds during agricultural operations.
2. Chemical control: spray 72% of streptomycin sulfate, 3000-4000 times of agricultural streptomycin sulfate powder, or 4000 times of neomycin, once every 10 days, and control 2-3 times continuously.
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