Sclerotinia sclerotiorum is the main disease of rapeseed in our province, which generally leads to a 10%~30% reduction in production, and a reduction in production by more than 50% in weight, and the oil content is reduced. Symptoms rape can be found in the ground. Leaf lesions have concentric ring patterns with a light yellow halo around them. The petal showed a pale yellow oily, small brown spot. The stems and branches formed water-stained, concentric ring-shaped fusiform or strip-shaped lesions, and there were a large number of murine bacillus sclerotia in stems. Occurrence of characteristic rapeseed harvest, sclerotia left in the soil, seeds and stubble overwinter winter. In the spring of March and April, pathogenic bacteria invaded the petals, leaves and stems of rapeseed with airflow. Rape grows well, suffers freezing damage, and rain is beneficial to the incidence of infestation. Prevention and control method a. The implementation of paddy crop rotation, grain and oil rotation. b. Narrow raft deep-groove cultivation will be implemented, and the ditch will be strengthened in the spring to prevent stains. c. Choose a light, sensitive seed. d. Select disease-free strains before harvesting, or sclerotate the sclerotia before sowing, or treat with 10% saline. e. Strengthen field management. Cultivate in early spring to destroy the source of bacteria. Rational fertilization to prevent late lodging or premature aging. Flowering and final flowering remove the lower middle disease, yellow and old leaves. f. Pharmacy protection. When the forecast is prevalent, the rate of leaf disease in rape at flowering stage is above 10%, and when the rate of stem disease is below 1%, spraying is started. 36% powdery mildew 100g, 40% yew spirit 75-100g, 50% fast keratin 50g, 40% sclerotin net 75g or 80% carbendazim ultrafine powder, 20% make 100g, etc. Spray 75 kg of water on the lower part of the plant, and control 1 to 3 times as appropriate. Chemicals prevention and control focus on good and susceptible fields.
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