Cabbage root disease, also known as big root disease, only harmed cruciferous crops, in addition to cabbage but also damage lotus white, broccoli, mustard and so on. Its wide distribution, heavy damage, has a tendency to spread. Cabbage can be affected during the seedling stage and adult plant stage. The roots are mainly damaged. The roots on the main roots can be seen with few root diseases and mostly close to the upper part. They are spherical or nearly spherical and have smooth or uneven surfaces. The lateral roots are cylindrical or The fingers are of different sizes, and the roots of the tumor are small and clustered. In the early stage of the onset, the symptoms are not obvious, and afterwards, the growth is slow and dwarf. The noodles at the base of noon are sluggish and return to normal sooner or later, and later the leaves turn yellow until wither. The germs mainly rely on the diseased bodies, carrier soil, rainwater and irrigation water. In general, the soil has high water content and acidity, and the incidence of cruciferous crops is heavy. 1. Rotation: Rotation of non-cruciferous vegetables for 4 to 5 years, paddy crop rotation for 2 years or more. 2, the application of lime: lime per acre 50 to 100 kg, so that the soil was slightly alkaline. 3. Use deep ditch sorghum or ridge cultivation to reduce the groundwater level and pay attention to drainage during rainy days. 4. Chemical control: Use 75% of pentachloronitrobenzene 1000 times solution to irrigate ponds (holes) or treat diseased plants before transplanting. It is also possible to use 500% of 55% of virgin mycorrhizal fungi or 58% of metalaxyl manganese sulphate 50%, once every 10 to 15 days.
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