Clubroot disease can occur at both the seedling stage and the adult stage of Chinese cabbage. It mainly damages the roots and causes the main roots or lateral roots to appear unequal in size, resembling fingers, short rods or globular tumors. The tumor on the main root is close to the ground, and the tumor surface is smooth at the early stage of disease. The surface of the tumor is rough, irregular, and cracked. There are as many as 20 tumors on the root, and they are strung together. The physiological function of the roots of the diseased plants was hindered. The aboveground part was obviously short and the leaves gradually yellowed from the bottom up. Before and after noon, the plants were wilting, which was like water shortage or malnutrition. In the early stage of the disease, the diseased seedlings can recover sooner or later, but they cannot return to normal at the later stage. The diseased part is easily infected by bacterial and other soft bacteria of cabbage soft rot, resulting in tissue rot and odor, causing the death of the whole plant.

Cabbage tuberculosis is a fungal disease. The germs live in the soil for more than 10 years after the dormant sporangia remain in the soil or adhere to the seed for winter, and are transmitted through rainwater, irrigation water, pests, and agricultural operations. Under suitable conditions, the germinating dormant sporangium germinated from the host's root hairs into the epidermal cells, causing the roots to form tumors for about 10 days. The earlier the disease is infected, the heavier the disease is, the greater the loss is, and the roots of the plants that have been infected in the later stages have grown and the damage is relatively light. The clubroot fungus is hi acidic soil, and the suitable soil pH value is 5.4-6.5, soil temperature is 20-25°C, and relative humidity is 60%-70%. The incidence of low-lying land, continuous cropping land and drought-restrained land is heavy.

Cabbage tuberculosis can be transmitted through the soil, and comprehensive measures should be taken to prevent and control it.

One of the agricultural measures is to use disease-resistant varieties. Chengyangqing, Dafeng No. 1, Qingza No. 3, improved Qingza No. 2, Lufeng No. 1, Qinmeng No. 1, Green Star 70, Jiaobai No. 6, and Jiaobai No. 8 were more resistant to diseases, and they were all resistant to disease. Can be selected according to local conditions. The second is the fall of rotation. Rotation with non-cruciferous crops for more than 3 years, such as corn crops such as corn, rice, wheat, etc., or leguminous crops such as kidney beans and soybeans. The third is to turn over the soil, planting deep sorghum and sorghum, and timely drain water in low season during the rainy season. The fourth is to adjust the soil pH. During the site preparation, 80 to 100 kg of lime per acre is used to adjust the soil to slightly alkaline. The fifth is to choose disease-free seedlings, eliminate diseased seedlings in time, bring them out of the field for destruction, and disinfect the lime around the sickle.

Medication prevention First, seed disinfection. For every 100 kilograms of seeds, use 25 g/L of Cloroxollenone to suspend seeds and 500 ml of water and 2 kg of water. The second is disinfection of soil or seedlings. Use 95% sodium propionate soluble powder 0.3 kg per acre, and apply 30 kg of fine soil into the live ditch. It is also possible to soak the roots for 20 minutes with 800 % liquid of 10% Cypromidone Suspension before transplanting.

In the early stage of disease prevention and treatment, 70% thiophanate-methyl WP can be used to irrigate the roots, and 0.5 kg of liquid medicine can be poured per hole, or be fixed at the base of the diseased plant with 20% quinacridone WP 1000 times. spray.

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