Sclerotinia: the main disease of rape, the most susceptible stage of fertility is the spring flowering period. Leaf lesions were round or irregular in shape, with a grayish-brown or tan-colored center and a yellow halo on the outer edge. The stems were eroded in the late stage of the disease and the cortex was longitudinally split, allowing the whole plant to die. The prevention and control measures are mainly to strengthen the field management and drainage, and use 50% carbendazim or 25% fluocin in 500 times of the first flowering period; 40% sclerotia net or 70% thiophanate-methyl 1000 times; 50 % Scroton 30 to 50 grams of water 50 kg dilution control 2 times, the interval is 7 to 10 days. Downy mildew: from rapeseed to mature stage can be diseased, after the victim leaves chlorotic spots, gradually yellow, lesions on the back of white downy mildew, after the disease expanded into brown spots, severe when the whole leaf withered. Spray 75% chlorothalonil, 60% mancozeb, 25% metalaxyl or methosulfuron 500-600 times solution, 10% double effect water agent 200 times, or Ledomil, antivirus矾, etc., have applied 2 or 3 times. Viral diseases and locusts: From the seedling stage of rapeseed to the convulsions period, they are all susceptible to disease. Because of different breeds, the symptoms are different. The first spot on the leaves of Brassica napus was brown spots, and the center of spotted spots on the back of the leaves turned brown and then blackened and dead spots appeared. Cabbage-type rape leaf first fades from the base of the veins along the sides of the veins, and is a typical mosaic and wrinkled. In severe cases, the heart is curled and the plants dwarf and cannot be convulsed. In order to transmit helminth-based viruses, the focus is to do a good job of locust control. In the early stage of virus disease, 20% of virus A, viral net, viral virus, and virus-killing wettable powder were each sprayed at 500 times, and sprayed once every 7 to 10 days for 2 to 3 consecutive times. Yellow song strips: Adults feed on young leaves to create dense holes, but also harm buds and tender larvae, larvae eat food roots. 90% trichlorfon crystals or 48% Loessben EC, or rattan extract, was used to dilute 1000 times of water spray during adult growth, and the larval stage could also be irrigated.
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