Black rot mainly jeopardizes the base of the celery roots and petioles, and is often infected near the ground, sometimes infecting the roots. After the disease became infected, the affected area became gray-brown and expanded to a dark green to dark brown color. The epidermis of the diseased area was intact, and after the rupture, the subcutaneous infected tissue became black and rot, especially the root and crown were perishable, and the leaf was drooping and withered. The rot is rarely expanded upwards or downwards, and many small black spots are produced in the diseased part, which is the conidia of the pathogen. Severe celery leaves decayed off.

Control methods: During the planting process, disease-resistant varieties should be selected, rotations should be implemented for more than two years, organic fertilizers, phosphorus and potassium fertilizers should be added, and flood prevention should be implemented. Clean up the sickness in the field in time and burn it or bury it deeply. In the early stage of disease, use 75% chlorothalonil WP 700-800 times, 40% methicone wettable powder 700-800 times, 50% carbendazim WP 800 times, 77% to kill Get WP 500 times or 50% thiophanate-methyl WP 500 times, spray once every 7-10 days, spray 2-3 times continuously. In the greenhouse, 45% of chlorothalonil aerosol was used to close the greenhouse in the evening for smoke, 0.25 kg per mu.

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