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This may be an early blight of celery, which mainly damages the leaves and petioles. At the beginning of the disease, yellow-brown immersed round spots were formed on the leaves, which later expanded into irregular large lesions. The lesions had no obvious edges; the petioles and stalks suffered damage, and the oval-shaped lesions were slightly sunken. The diseased plants were easily broken and lodging. In the wet, a gray mold layer was formed on the lesion. When the disease was severe, the leaves were dry and the plants died. Large temperature difference between day and night, lack of fertilizer and water, flood irrigation, high air humidity, poor plant growth and other diseases. To prevent the occurrence of the disease, the diseased plants can be collected and burned or buried deeply and the seeds can be disinfected strictly. Chemical control can be used in the early onset of 80% of Dasheng WP, 72% of Kelu wettable powder 600~800 times, 80% of Xinwansheng WP, 45% of Dakkoning suspoemulsion 600~800 times, 2 % Kasugamycin WP 300 to 400 times, 25% chlorothalonil WP 600 times, 50% carbendazim WP 800 times, 70% Mancozeb WP 500 times spray , Every 5 to 7 days, even spray 3 to 4 times.