萝卜在生长期间,最常见的病害有白锈病、病毒病、黑斑病和黑腐病等四种。防治方法:白锈病主要危害叶、茎。叶片发病正面退绿,背面产生白色疮斑,破裂后散出白粉。病毒病主要发生在叶片上,受害后产生绿色斑驳,叶片变成花叶,对萝卜生长发育影响很大。黑斑病主要危害叶片和叶柄。叶片发病后产生圆形黑色病斑,有轮纹,上有黑色霉层,茎上发病后产生褐色印圆形或长条形病斑。黑腐病发生后,叶片边 Radish in the growth period, the most common diseases are white rust disease, viral disease, black spot disease and black rot four kinds. Prevention and treatment methods: white rust main hazards leaves, stems. The incidence of positive green leaves back, the back of white sores, rupture of the white powder. Virus disease occurs mainly in the leaves, green mottled victims, the leaves become mosaic, a great impact on the growth and development of radish. The main black spot disease leaves and petioles. After the onset of leaf round black lesions, there are round pattern, there is black mold layer, the stem after the onset of brown printed round or strip-shaped lesions. Black rot occurs, leaves edge