Prevention and control of celery spot blight, should take comprehensive measures to prevent and control. Should be the main prevention, when the seedling height 2-3 cm, should be sprayed timely 75% chlorothalonil WP to prevent, and with the new high-fat membrane 800 times to enhance the efficacy. 1. Balanced fertilization. The fully-fertilized organic manure was applied in the base plant. Phosphorus and potassium fertilizers were applied at the growth stage to control the amount of nitrogen fertilizer, and foliar fertilizer and micro-fertilizer were sprayed in time to enhance the plant's resistance to stress. 2. Cooling and humidity. Daytime temperature control in the 15-20 °C, more than 20 °C timely ventilation, night control at 10-15 °C, reducing the temperature difference between day and night, reducing condensation. Can not flood irrigation. 3. Chemical control. The spraying of celery seedlings began at a height of 3 cm, 70% mancozeb WP, 58% metalaxyl WP, antiviral 64% MnZn WP, 75% Bacterial WP, 50% carbendazim WP, etc., once every 7-10 days, continuous control 2-3 times. Early onset of disease prevention and control, try to avoid spray spraying, you can use 45% chlorothalonil smoke agent 200-250 grams per acre smoke, or per acre with 5% chlorothalonil powder 1000 grams to reduce the shed humidity. Laminate Panel Security Door,Apartment Security Door,Laminate Exterior Security Door,Laminate Entry Security Door Zhejiang Tilanco Industry&Trade Group Co., Ltd , https://www.tilancogroup.com