How to prevent clubroot disease in Chinese cabbage
(1) Agricultural control: Minimum 3 years or more of crop rotation, 5-6 years of crop rotation for disease-hazardous plots, try to avoid planting cabbage on low-lying plots and poorly drained plots. If planting is also used for sorghum or sorghum, In the acidic soil on the kind of cabbage, it is appropriate to use lime, the soil pH is adjusted to slightly alkaline, combined with soil preparation in the acid soil per acre lime 100-150 kg, and increase the application of organic fertilizer.
Seedlings transplanted with cabbage are treated with soil-free seedlings or chlorinated with quintozene before sowing, and can also be supplemented with zeocin, resulting in better mixing.
Strengthen the cultivation and management, timely rule out the accumulation of water in the field, seriously remove the diseased plants and carry them out of the field and burn it. Drain lime around the diseased plants to prevent the spread of germs. After harvest, the roots are completely removed and transported out of the fields for burning.
(2) Chemical control: Before sowing, use 70% pentachloronitrobenzoic acid WP 2-3 kg to mix 40-50 kg of fine soil, and then apply the planting ditches to planting or sowing cabbage vegetables. After the onset of illness, use 40% pentachloronitrobenzoic acid WP 500 times, or 70% thiophanate-methyl wettable powder 800 times, and 50% thiophanate wettable powder 500 times to irrigate each drug solution. 0.3-0.5 kg.
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