Celery crown rot mainly damages the root neck and the base of petiole, and it has more incidence during storage after harvest. The victim’s department was gray-brown at the beginning and gradually turned dark green or black after its expansion. The lesions do not have a certain shape. The epidermis is intact at the early stage of the disease. After the enlargement, the epidermis is broken and the subcutaneous discolored tissue is exposed. Sometimes, secondary parasites or saprophytic bacteria invade from the wound, and the root canopy near the ground can be rotted. The decayed part rarely spreads downwards or upwards. Prevention methods are as follows: First, use disease-free seeds or sow seeds for three years to avoid seed sickness. Secondly, soak seeds in warm water of 48°C-49°C for 30 minutes before seed sowing. When soaking seeds, they should be agitated constantly to make the seeds heated evenly, and then remove and soak germination. This can kill pathogens attached to the seeds. Before harvesting, plants were sprayed with 1:0.5:200 Bordeaux mixture, 65% mancozeb WP 500 times, and 70% chlorothalonil wettable powder 600-700 times. Face Mask 3 Ply,FFP2 PM2.5 Mask Filter,Men'S Mask CE 0598 MA-001,Anti Dust Flu Face Mask Zhejiang Minan Medical Supplies Co.,Ltd , https://www.minanmask.com