Symptoms of the disease occurred when the disease, rape leaves lesions were round or irregular shape, the center of gray brown or brown, dark green cyan, outer edge with yellow halo. The lesions ruptured and perforated when dry, and rapidly expanded under humid conditions. The whole leaf rotted and the white mycelium grew above. The lesions on the stems were fusiform, slightly depressed, with white middle and brown edges. In humid conditions, the lesion progressed very rapidly and white mycelium grew above. In the late stage of disease, the stem and marrow were eclipsed, the cortex was longitudinally split, the vascular bundle was exposed, and the root was easily broken. Many black granular sclerotia were formed in the stem. Severely infected plants die.
The prevention and control measures can be controlled when the flowering rate of the main stem is more than 95%, and the rate of one branching and flowering is about 50%. It should be noted that S. sclerotiorum has generally been resistant to carbendazim agents, using sclerotia net, procymidone, 100 g, valsarin (Diacetylcarbine), and the enemy off (C Cyclozole) single agent and its compounding agent have good effects, and can use 40% sclerotin net wettable powder 100-150 grams per acre, or 50% procymidone (Siklyl) wettable powder 35-50 grams Water spray control. Can also use 25% per acre to make 100 grams of 40 to 50 milliliters, or 50 per cent of Mildew Ling 100 grams, or 25% of the enemy off 25 to 30 milliliters, or 50% fortune nucleus (Fu Mei pairs + sclerotia net) 80 ~100 grams of water spray control. At the flowering stage of rapeseed, the yellow leaves, old leaves, and diseased leaves of the whole plant were removed and the removed leaves were taken out of the field.