Rapeseed virus disease has occurred in all areas of rapeseed production in the country. In systemic spotting, the diseased plants of Brassica napus appeared on the system. The old leaves had an early onset and the symptoms were obvious, and they spread to new leaves. At the time of first onset, a pinpoint-sized transparent plaque was produced, which expanded into a nearly circular 2-4 mm macula. The center was dark brown with dead spots and the necrotic spots were stained around. Black and black fusiform to long stripe lesions appeared on the vegetable stems, and spread from the lower part to the branches and fruit stems. Lateral lesions on the stems were mostly split or horizontal, and flowers and pods were easy to wilt or die. The pods produce black dead spots and are often malformed. The pathogen is mainly turnip mosaic virus. Rapeseed often cut production by 50% to 60%. The virus is mainly transmitted by locusts. The rapeseed cultivation area is dry or drizzle in autumn or spring and the temperature is high, which is conducive to the occurrence of locust infestation and migration of winged maggots. The disease is easy to occur and prevalent. Early sowing or transplanted rapeseed in spring and late spring rape are susceptible to disease. The following measures are taken to prevent and treat the disease: (1) Varieties of rape resistant to viral diseases, such as Ningyou No. 7, Glycerin No. 5, No. 12 of Oolong, No. 13 of Oolong, and Xiangza miscellaneous oil resistant to mosaic virus No.1, Rongyou No.3, Yuyou No.2, Zhongshuang No.4 and other varieties. (2) Adjust the sowing date. According to the rainfall forecast for September-October of the same year, the sowing date should be determined, and less rain and drought should be appropriately delayed. (3) Rape fields should be kept away from cruciferous fields as much as possible. (4) cure and prevent disease. Timely use of dimethoate, 20% cyanoma EC and other drugs to treat aphids. (5) In the initial stage of disease, spray 0.5% anti-drug Fengru proteoglycan hydrolyzate 300 times solution or 10% virus king WP 500 times solution, or 1.5% plant disease disease emulsion 1000 times solution, 83 sensitizer 100 solution, Once every 10 days, continuous control 2 to 3 times.
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