识别要点胡萝卜菌核病只为害肉质根,生育期间发病,致使地下肉质根软化,外部出现水渍状病斑,严重时腐烂。潮湿时,病部表面出现白色棉状菌丝体和鼠粪状菌核。菌核初为白色,后变黑色,贮藏期间可继续发病,如发现不及时,可造成整窖腐烂。发生规律该病为真菌性病害,病菌以菌核在土壤中越冬。第二年春天借风、雨接触等传播,其发病适温为20℃,在潮湿、积水条件下易发病,植 Identification of points carrot sclerotisia only for the flesh root, during the onset of disease, resulting in underground fleshy root softening, the external appearance of water-like lesions, severe decay. When wet, there are white cotton-like mycelium and rat droppings on the surface of the diseased part. Sclerotium at the beginning of white, black later, can continue to disease during storage, if found not timely, can cause the entire pit decay. The law of occurrence of the disease is a fungal disease, bacteria in the soil by bacteria in the winter. The next spring spread by the wind, rain and other contacts, the onset of suitable temperature is 20 ℃, in wet, stagnant water conditions prone to disease, planting