Cabbage black root disease mainly infects the roots and neck of the seedlings, causing the diseased part to become dark and curled. When wet, there is a little white moldy material on it. After the onset of the disease, the leaves can be seen wilting and dry, resulting in the death of the whole plant. The diseased seedlings generally stop development after colonization, but individual fields can still continue to die, causing a lack of seedlings in the field. Prevention methods include:
1. A three-year rotation with non-cruciferous vegetables.
2. Before sowing, use 50% thiram or 65% zeocin zinc wettable powder dressing.
3. The seedbed is selected in a high-lying and well-drained place. The disease-free new soil is selected as the seedbed. The old seedbed is to be soil-sterilized and mixed with 40% pentachloronitrobenzene powder and 50% thiram. Take 9~10g per square meter and mix it with 3~4kg of fine soil. Spread 1/3 of the medicine soil before sowing on the surface of the bottom water. After sowing, cover the rest of the soil with pesticide. on.
4, the application of mature manure, sowing should not be too dense, cover soil should not be too thick, strengthen the field management after planting, timely drainage, emergence of diseased seedlings in a timely manner.
5, chemical control can be used 20% methyl tolclofosin 1000 times, or 60% more Fu 500 times, or 75% chlorothalonil 600 times, or copper ammonia mixture 400 times, or 45% Tektronix Suspension 1000 times and so on, 7 to 10 days, even spray 2 to 3 times.
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