Cruciferae nodule disease may occur in cabbage, vegetables and other crops. Rhizobia is a plant disease caused by moss. The pathogen is a dormant sporangium, which can live in soil or attach to seeds for wintering, and can live in soil for 10 ~ 15 years. Sporangium is spread by rain, irrigation water, pests and agricultural operations. The germinated and swimming spores invaded the host, and the roots grew tumors for about 10 days. Disease-resistant plants include cruciferous plants, such as cabbage, Chinese cabbage, broccoli, wildlife parks, mustard greens, radishes and turnips. After crops are infected with rhizosphere bacteria, smooth or cracked tumors of different sizes will be formed in the roots. Rhizobia mainly harm the roots of plants. At the beginning of the disease, the roots often deform and spindle tumors appear. The seedlings will be hurt, and in severe cases, the seedlings will wither and die.

Do a good job in seed disinfection. Soak in 55 warm water for 15 minutes before sowing, then soak in 10% cyanide cream suspension for 2000~3000 times, soak in 10 minutes, and then clean and sow. Sterilize the seedbed with 500 times solution of 50% red bull mobile phone sodium soluble powder or 10% cyanide cream suspension 1000~ 1500 times solution, spray the seedbed, and the leaching depth is about 15 cm.

Disinfect the fields before transplanting. The reagents used are fluorobutylamine and spectral bacteria. Spraying bromoamine mixture for soil treatment is an effective drug to prevent and treat clubroot, but it will inhibit the growth of seedling roots at high concentration and cannot be used for centralized drug treatment such as root irrigation. 60% of the bacteria are sprayed 750 times, and the disinfection effect of soil in the field is 70% to 80%. Prevention and treatment of spraying drugs after onset. After the symptoms of root edema appear in cruciferous vegetables in the field, 10% cyanocream suspension 1500~2000 times, or 800 times of 75% white fungus moisturizing powder, or 20% quinolone moisturizing powder 1000 times should be sprayed on the affected area for prevention.

Cabbage can't be planted in places with low temperature in winter, but it can also be planted in spring, summer and autumn. In the process of growth, you can also find that the roots of Chinese cabbage grow strangely. Some roots are similar to ginger. Some have many nodules. The roots are swollen. Roots of this shape appear after Chinese cabbage is planted in the ground, all of which are nodules of Chinese cabbage. In the early stage of cabbage clubroot, the color of cabbage leaves became lighter and the luster disappeared.