油菜病毒病是我市油菜主产区主要病害之一,近年来发病逐年加重。据调查,2002年发病重的田块病田率70％—100％,病株率达50％—60％,重者达80％以上,经济损失达60％以上,甚至绝收。为此,必须实施综合防治技术,以有效防治该病发生为害。 一、田间症状 甘蓝型油菜染病后,其主要症状表现为系统性的黄斑和枯斑,以黄斑占多数,叶片正面呈黄褐色病斑,背面斑点中心先变褐,后变黑,产生枯死点,并逐渐向 Rape virus disease is one of the major diseases in our main rapeseed area. In recent years, the incidence has been increasing year by year. According to the survey, the incidence of field disease in 2002 was 70% -100%. The rate of diseased plants reached 50% -60%, and those with severe diseases reached more than 80%. The economic losses reached more than 60%. To this end, we must implement comprehensive prevention and control technology to effectively prevent the occurrence of the disease. First, the field symptoms Cabbage rape disease, the main symptoms of systemic manifestations of macular and dead spot, the majority of the macular, yellowish brown frontal leaves lesions, the back of the first spot brown spots, black, resulting in dead And gradually to