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胡萝卜丝核菌根腐病在连作地易发生,一般春播胡萝卜发病重,特别是5月中旬至7月中旬多雨年份,病害常暴发成灾。发病症状主要为害根部。发病初时,在肉质根表面产生污垢状的小斑点,不断扩展成不规则形、水浸状、褐色病斑。湿度大时,病斑上生有污白色蛛丝状菌丝,病斑也软化腐烂。病斑多在肉质根的上部出现,向上扩展至叶柄基部,使叶柄基部门变褐色,呈立枯状。防治方法1.农业措施选地势较高燥、排水良好的地块种植。深耕、细耙,施
Rhizoctonia radici root rot occurs in succession, the general incidence of severe carrot in spring, especially in mid-May to mid-July rainy years, the disease often outbreaks. The main symptoms of the root damage. Early onset, in the fleshy root surface of the dirt-like small spots, expanding into irregular shaped, flooded, brown spots. When the humidity is high, the spot on the dirty white spider filamentous mycelium, lesion softening decay. Lesions appear more in the upper fleshy root, extending up to the base of the petiole, petiole base Department brown, was standing dry. Prevention and treatment methods 1. Agricultural measures selected high dry, well-drained plots planted. Deep plowing, fine rake, Shi