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Carrot black rot
Identification points: from the seedling stage to the harvesting period or storage period can occur, mainly damage the fleshy roots, leaves, petioles and stems. The leaves become infected and dark brown spots are formed, causing serious death of the leaves. Petiole long strips. Most of the stems were spindle-to-striped, with no obvious lesions on the edges. When the humidity is high, the surface of the black mold layer is dense. Most of the root infections of the fleshy roots have irregular or round dark spots on the root head. In severe cases, the lesions spread and deepen to the inside, making the fleshy roots black and rot. Control methods: (1) Before seeding, seed dressing with 0.3% seed weight of 50% thiram or 70% mancozeb. 2 Seeds are collected from disease-free plants so that they can be collected in a single collection. 3 2 years of rotation, adding basal fertilizer and top dressing. 4 At the beginning of the disease, 75% of chlorothalonil 600 times solution and 70% of mancozeb manganese 600 times solution were sprayed at the beginning of the disease, and the control was continued 2-3 times every 7-10 days.