3) Control methods Agricultural control. Most sclerotia rot in the field after germination. Most of the sclerotia that have been preserved for more than one year lose their germination rate. The rotation of crops such as rice, wheat, wheat, and other crops for more than two years will result in a disease reduction rate of 91.5%. Rapeseed mantle generally should not be more than 2 meters wide, and it should be turned into a turtle shape. The depth of sulcus and gutter should be more than 30 cm. Clear the ditch immediately before flowering, so that both the row and the irrigation can be done to ensure that no water accumulates in the field. There is a great difference in disease resistance among the varieties. Qinyou No. 2 is relatively resistant to disease, while the double low “51†rape is poor in disease resistance. Deep plowing in the spring and cultivating soil 1-2 times in spring can break off and flood the subcapsule plate. Immediately before the onset of disease, the middle and lower old yellow leaves were removed, and more potassium or ash was applied to enhance the disease resistance of stems. 2, chemical control. Before sowing, 50% dimethyl sulfoxide (Sikronin) was used for seed dressing. The dosage was 0.3-0.5% of the seed amount, the control effect was 67.8%, and the increase rate was 11.5-15.8%. It is also possible to treat the soil with 2 kg of 50% dimethyl sulphoxyl. In the flowering period of rape (50% rape blossoms), spraying began when the stems had not yet developed. The interval between two sprayings is 8-10 days, 50% dimethyl sulfoxide can be used, 25-30 g per mu, and 100 kg sprayed with water, the control effect is 92.3%, and the effect of increasing production is 24.92%. 50% of iprodione (promethine), 66-100 grams per acre, watered 100 kg of spray, control effect of 85.5%, an increase of 20.5%. 40% carbendazim, 37-62 g per mu, and 100 kg sprayed with water, the control effect was 65.25%, and the effect of yield increase was 12.35%. In addition, one spray of sulphur and lime powder (1:8) can be sprayed at the flowering stage and at the end of full bloom, with a dosage of 3-45 kg per mu; or charcoal and slaked lime powder (4:1), spraying dust per acre 25- 30 kilograms.
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