(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 nitroge