牛蒡分根用蔬菜和药用药材二类。目前作为根用蔬菜是出口创汇和国内食用的稀特蔬菜,多为春、秋种植。连年种植下势必发生各种病害。据报导苗期常发生细菌性黑斑病、病毒病、黑斑病、根黑变病(该病为根腐病、黑痣病、萎蔫病和线虫病等多种根病混淆时的总称);生长期发生白粉病、? Burdock root vegetables and medicinal herbs two categories. At present, root vegetables are the rare and special vegetables for export and domestic consumption, mostly for spring and autumn planting. Successive years planting is bound to occur a variety of diseases. It is reported that bacterial black spot disease, viral disease, black spot disease and root melanosis disease often occur at the seedling stage (the disease is a general term when root diseases such as root rot, mole disease, wilt disease and nematode are confused) ; Occurrence of powdery mildew in the growth period,?