Cabbage rot disease is a common disease. There are many causes of the disease, such as roots caused by physiological diseases, and pathological roots such as soft rot. This has a lot to do with rain, soil moisture and temperature fluctuations.
Cabbage is a cool vegetable, and the suitable temperature for growth is 10°C～22°C. It is not heat-resistant. When the temperature exceeds 32°C, the photosynthesis is weak and the respiration is enhanced. The growth is very weak. Cabbage is a hi wet vegetable, and it requires moist soil conditions throughout the growing season, especially Chinese cabbage cannot be water-deficient during the rosette period and the filling period. Chinese cabbage is also not resistant to waterlogging, and long-term waterlogging can also cause roots to die. Because in the hot season, in the event of continuous rain, the soil is full of moisture, lack of oxygen, anaerobic respiration of cabbage roots, will lead to root cell death.
In the onset of seedlings, the base of the stem was immersed in water, rotted, lodging, and star-shaped. In the case of adult disease, most of the outer leaves become wilted during the day, recover at night, and then gradually die from the outer leaves. The roots turn brown and rot. The roots shrink in the middle and the lower part disappears, leaving only the upper part.
Prevention and control points: (1) Choose to plant high or flat terrain. (2) Avoid continuous cropping of cruciferous vegetables. (3) It is best to change the live broadcast for transplanting seedlings. (4) Strictly prevent flooding after flooding and irrigation and after rain. (5) In the early stage of disease, the drug can be controlled in time and can be used to irrigate or spray the plant stem base and surrounding soil with 72% Kelu 1000 times liquid, or 72.2% Prec 800 times liquid, or 15% hymexazol 400 times liquid.
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