Coming to Lao Zhang's cabbage field, I found that the height of the cabbage was uneven, the seedlings were in a terrible mess, the cabbage entered the early stage of the succession period, but the cabbage plants were short and slow-growing, and the leaves at the bottom gradually withered and yellowed, and some of them had already withered and died. So I pulled off a cabbage and found that the main root, side roots and roots of the cabbage were full of root seeds of different sizes. What a cabbage with myxomatosis. When it comes to cabbage rhizoctonia, it can generally occur in fields that are reduced by 10%, and in plots where it occurs severely, yields are reduced by more than 30%. Cabbage growers note that the early symptoms of rhizoctonia occurring is not obvious, we growers only see the leaf symptoms, do not see the root symptoms, it is difficult to distinguish, until the cabbage wilted, they only noticed. It is relatively late to let it go at this time.

Cabbage rhizomatosis usually occurs in the seedling and sitting period, how to effectively prevent the occurrence of cabbage rhizomatosis? We suggest growers do the following. Apply enough rotten organic fertilizer as the bottom fertilizer, pay attention to the joint use of nitrogen, phosphorus and potassium, and not to be partial to nitrogen fertilizer. Use of ridges or mounds for cultivation can be effective in reducing the incidence of rhizoctonia. Treat the soil at the time of planting by treating the inside of the re-setting hole with quintozene powder per acre. Roots can be treated at transplanting with a biofungicide or fomite pair, and rhizoctonia can be prevented promptly after it occurs by treating the roots with a fungus.

This disease survives for a long time in the soil and spreads cabbage and other cruciferous plants through the soil. When making seed, colonies are attached to the seed and the seed becomes infectious. The pathogen develops at temperatures of 9-30, with an optimum of 20 ~ 24. The cumulative temperature for spore germination and disease progression is 18 ~ 25. The pathogen overwinters in the soil along with diseased roots, invades the host from young roots or wounds, borrows rainwater, and spreads irrigation water and farm equipment. The disease is less incidence in dry years. Acidic soils are severely affected, and every year plots planted with crucifers and plots in the lower part of the propylene field, as well as plots with unrotted malodorous fertilizers, have been heavily affected by the disease.

Practice crop rotation with non-cruciferous vegetables for more than five years. Seeds can be selected from disease-resistant varieties, sterilized and seed-mixed to avoid subterranean pests and diseases, isolate viral infections without affecting the function of germination and expansion, and enhance the intensity of respiration to improve seed germination. Pharmaceuticals can be prevented by irrigation utilizing Bacillus subtilis. Remove bottle columns and take them out of the field to burn or bury them y. Application of lime to change the soil pH, usually 75-100 kg of powdered lime in ignorance or spraying 15% milk of lime at the beginning of the disease, adding 0.3-0.5 liters per plant. In the seedling stage, spray the new high fat film in time to prevent the infection of the disease, so that the seedlings will thrive. Strengthen management: timely watering of cabbage growing organs, autumn rains, Chongqing weeding, improving plant disease resistance, timely spraying of strong stems, so that the stems are thick, leaves are fat, leaves are fresh, plants are lush, and the natural flavor is strong. It can improve disease resistance, reduce the use of pesticides and fertilizers, and reduce residues.