Sclerotinia sclerotiorum is one of the most important diseases of rapeseed. It occurs from the seedling stage to the mature stage, but it is heavier with the final flowering stage to mature stage. The bacteria infested the leaves and petioles, stalks, flowers, and pods of rapeseed. Controlling the occurrence and harm of Sclerotinia must adopt comprehensive prevention measures according to local conditions. 1. Select good varieties: choose early-maturing, disease-resistant, high-quality and high-yield rapeseed varieties. Seriously do seed treatment before sowing to eliminate sclerotia on seeds. 2, away from the host: Sclerotinia germs host a wide range, in addition to cruciferous vegetables, lettuce, carrots, milk vetch and tomato are susceptible. Therefore, rape fields should be kept away from host plants as much as possible to prevent and reduce the spread of germs. 3, rotation for crops: rape as far as possible to avoid continuous cropping, the best implementation of dry and dry crop rotation, in order to reduce the amount of field sclerotia. 4, to improve the structure of the group: transplanting with wide and narrow lines, width 50-60 centimeters, narrow line 20-30 centimeters, acres transplanted 1000-1200 strains to improve ventilation and light conditions. 5, scientific fertilization: increase organic fertilizer and phosphorus potassium fertilizer, appropriate application of nitrogen fertilizer. 6. Qinggou Drainage: Open the ditch, gutter, gutter and main ditch, so that there is no clear water with rainfall, no dark spots on sunny days, reduce the humidity in the field, and prevent the damage caused by waterlogging. Remove diseased leaves and old leaves in time to bring deep burial in the fields to reduce the source of bacteria and improve air and light transmission. 7, chemical control: rape flowering period is the most susceptible period. The winter and spring temperatures are low, and it is expected that the flowering period of rape will be delayed compared with previous years. The first flowering period to the full flowering period will be from mid-March to the end of March, and it is also a critical period for prevention and control. When the diseased stem rate exceeds 1% or the diseased leaf rate exceeds 10%, the pesticide application must be controlled in time. 40% sclerotium net wettable powder 500 times, 50% carbendazim 500 times, or 70% thiophanate 500-600 times spray per acre. 8, to improve the harvesting methods: 50% -90% of rape sclerotia are concentrated in the base of the stem less than 5 inches, in the severe ward and severe disease field when the rapeseed mature, the uprooted plants should be uprooted to prevent sclerotia off the field.
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