萝卜黑腐病俗称黑心、烂心，是全国性的常见病害。萝卜根内部变黑，便失去商品性。此病还危害白菜类、甘蓝类等多种十字花科蔬菜。 1 症状识别 危害叶和根。叶片发病，叶缘多处产生黄色斑，后变“ V”字形向内发展，叶脉变黑呈网状，逐渐整叶变黄干枯。病菌沿叶脉和维管束向短 Radish black rot commonly known as black heart, rotten, is a national common disease. Radish root dark inside, they lose the commercial nature. The disease also endangered cabbage, cabbage and other cruciferous vegetables. 1 Symptoms Identify the harms of leaves and roots. Leaf incidence, multiple leaf margin yellow spots, after the change “V” shape inward development, veins black mesh, and gradually the entire leaf yellowing dry. Bacteria along the veins and vascular bundles to short