The clubroot disease is a fungal disease. This disease not only harms rape, but also harms cabbage, radish, mustard, cabbage, broccoli and other cruciferous species to varying degrees. Clubroot disease mainly damages the root of rapeseed and it can be damaged at the seedling stage. In severe cases, the seedlings die. In the early stage of adult plant damage, the upper part of the ground was not obvious, but it was slow growing, short and heavy, and it was in a state of water shortage. The base leaf was wilt at noon and could be recovered sooner or later; when it was late, the leaves were yellow and withered until the whole plant died. When the soil is overwintering or over-summer in the soil, a large number of dormant sac sacs are contained in the swelled cells of the main diseased roots of the crop. After the diseased tissue rots and decomposes, the bacillus is scattered in the soil, and it can survive for 6 to 7 years in the soil. Now the disease conditions and control methods are described as follows: 1. Incidence conditions 1.1 Soil temperature and humidity. The disease will not occur in the temperature and humidity range of 6-30 °C; field water in the range of 50% - 98% can be the disease, if the amount of field water below 45% bacteria easily dead. 1.2 Soil pH. The bacteria are suitable for the acidic soil environment. If industrial water is used for irrigation, the disease will occur and become popular (due to the high acid content of industrial water). 1.3 Clay soil is the source of soil on which clubroot disease develops. 1.4 The use of acidic fertilizers in large quantities on the land can cause diseases, such as the hazards of underground pests and the roots of artificially-damaged vegetables. 2. Control methods 2.1 Strengthen the quarantine and treatment of seeds. Seeds that enter the diseased area must be treated with pesticides and bactericides, or sprayed with 908 fungicides before sowing. 2.2 Crop cultivation. 2.3 To reform the acidic soil, a fly ash compound fertilizer plant can be built in the region to fundamentally reform the acidic soil and clay, improve the disease resistance and disease resistance of the crops, and relieve root and tuberous diseases. 2.4 Available medicines after the onset of crops. It is also possible to build a plant cleaning agent for pesticide use in the region, which is self-produced and self-sufficient to solve the agricultural disease hazard. China Agricultural Network Editor