(1) The use of rice oil rotation or dry land rape and gramineous crop rotation for more than two years can reduce the source of bacteria. Before the rape blossoms, cultivating the soil for 2 to 3 times can not only promote the development of the root system and prevent lodging, but also bury the germicidal nucleus and reduce the disease.

(2) In rainy areas, the narrow-chamber deep-ditch cultivation method is implemented, which is conducive to water drainage in spring to prevent stains, and timely drainage after rain to prevent moisture retention. Drain the drainage ditch so that the open water can drain, the dark water can drop, and the rain stops the field and dry. Maintaining good soil permeability is conducive to deep rooting of rapeseed. Generally, the width and depth of the drainage ditch are 20 cm each.

(3) Selection of resistant and disease-tolerant varieties.

(4) Carry out seed treatment before sowing, use 10% salt water to select seeds, eliminate the floating diseased seeds and small sclerotia, and dry the selected seeds before sowing.

(5) Choose a seedbed every September, cultivate short and strong seedlings, change crops and transplant them at the right time, and achieve reasonable dense planting, and plant 10,000 to 12,000 hybrid rapeseed 667m2.

(6) Adopt formula fertilization technology, promote the application of compost made by enzyme bacteria or decomposed organic fertilizer, avoid partial application of nitrogen fertilizer, and apply phosphorus, potassium fertilizer, boron and manganese and other trace elements to prevent prolonged flowering and pod setting period, lodging or premature defertilization , Timely cultivating or clearing the ditch to cultivate the soil, and timely removal of yellow leaves and old leaves during the blooming period to prevent the spread of pathogens, improve the ventilation and light conditions between plants, and reduce the incidence of disease. Reasonable fertilization and proper control of the application of nitrogen fertilizer, supplementary application of phosphorus and potassium fertilizer It makes the rape seedling stage strong, the moss stage is stable and long, and the stalks are hard at the flowering stage.

(7) Chemical control. The rice oil cultivation area focuses on two preventions. Firstly, during the peak germination period, spraying pesticides on the ridges around the rice stubble rape field to kill the ascospores and ascospores from the germination of sterilized nuclei; secondly, 38% frost fungus was selected in the rape field during the blooming period of early and mid-March. 800 times liquid of ester water or 1000 times liquid of 41% polypyrimethanil, 1000 times liquid of Beira bromide wettable powder, 2000 times liquid of 30% methamphetamine, and 1500 times liquid of 50% prodynein wettable powder , 50% Nongliling WP 1000 times liquid, 50% Thiophanate methyl 500 times liquid, 20% Tolclofos methyl EC 1000 times liquid. You can also use 100ml of Caibao to add 15-20L of water, soak the roots of rape in the syrup and then plant them. It is recommended to apply 200ml of Fungus King Fertilizer, mixed with 600g of carbendazim hydrochloride and add 60L of water to prevent and cure rape sclerotium disease at the end of the first flowering stage, with a control effect of 85%.

(8) Biological control. Remove the old yellow diseased leaves in time, remove the lower old yellow feet and diseased leaves at the later stage of flowering, and the few overgrown fields can be carried out in advance to the full blooming period.