Control methods of rape sclerotium disease

First, the rotation of rice and oil should be carried out, and rape in dry land should be rotated with wheat and wheat for more than 2 years. Second, in rainy areas, it is necessary to do narrow compartments, open deep ditches, and do a good job in clearing ditches and preventing stains in time. The third is to choose varieties that are less susceptible to disease. Fourth, sow disease-free seeds. Fifth, rational application of nitrogen fertilizer. With phosphorus, potash fertilizer and boron, manganese and other trace elements. Sixth, the middle and lower part of the plant disease, yellow and old leaves were removed for 1 to 3 times and taken out of the field for deep burial or incineration. Seventh, spraying is carried out when the rate of leaf disease is more than 10% and the rate of stem disease is less than 1% at flowering stage. Eighth, after the rape harvest, the dry land pulled out the stubble, together with the stump stalk and pod shell concentrated retting fertilizer or burning.