Experts reminded that in order to quickly identify, we must first look at the "v" shaped lesions of the leaf margin, the necrosis of the veins on the lesions, the vascular bundles become black, the outer skin of the roots becomes black, the internal tissues are dry and the vascular bundles become black. The pith tissue is black dry rot, even hollow. When the humidity is high, the diseased part produces yellow-brown pus or oil-soaked wet rot.
Control method:
1. Seed treatment. Soak seeds in warm water at 50 ° C for 30 minutes. It can also be seeded with 50c/o Fumei double wettable powder with a seed weight of 0.2c/o or 35c/o nail cream .
2. Agricultural measures. Rotating with non-cruciferous vegetables; using resistant varieties; sowing should not be too early, suitable for seedlings; small water in the seedling stage, lowering soil temperature, timely removal of diseased seedlings.
3. Prevention and treatment of pesticides . At the time of sowing, apply 750 grams of 50c/o Fumei double wettable powder per acre, add 10 liters of water, mix it into 100 kilograms of fine soil and sprinkle it into the hole. In the early stage of the disease, the commonly used agents are 72c/o agricultural streptomycin-soluble powder 3000-4000 times solution, 47c/o plus Ruiren WP 700 times solution, 50c/o can kill WP 500 solution. Once every 7-10 days, continuous control 3-4 times.
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