油菜病毒病是长江流域油菜区的主要病害之一,根据多年实践,干旱年份油菜病毒病往往易流行危害,2013年油菜播种后很长时间,气温较高,天气持续干旱,在南方冬油菜区该病的发生率普遍上升,其发病率一般为15%至20%,严重的地方发病率达到50%左右。发病后产量下降,籽粒干瘪,含油量下降,甚至在开花结荚期即行枯死。据测算,重病区流行年份一般损失率达20%~30%,严重者达70%以上,值得引起重视。发病症状。油菜病毒病从苗期至角果发病期均能发生,不同类型的油菜发病症状差异很大,白菜 Rape virus disease is one of the main diseases in the rapeseed area in the Yangtze River Basin. According to many years of practice, the rape virus disease in the dry years is often prone to epidemics. After rapeseed was planted for a long time in 2013, the air temperature was high and the weather continued to be dry. The prevalence of the disease has generally risen, with a prevalence of 15% to 20% and a severe local incidence of about 50%. After the onset of decline in yield, grain shriveled, oil content decreased, and even blossoming pod in the line died. It is estimated that the prevalence of severe ward years the general rate of loss of 20% to 30%, in serious cases of more than 70%, it deserves attention. Symptoms. Rape virus disease can occur from the seedling stage to the onset of the jackfruit, different types of rape vary greatly in the incidence of symptoms, cabbage