First, celery soft rot Occurs mainly at the base of the petiole or on the stem. Water-soaked, light-brown spindle-shaped or irregular-shaped depression spots appeared first, followed by wet rot and black stinky, leaving only the epidermis. Pathogenic bacteria in the soil in winter, invasion from the wound, spread by rain or irrigation water spread. Humidity is high when the humidity is high, and sometimes it is mixed with frost damage or other diseases. Prevention and control measures: 3 years or more of crop rotation; avoid rooting when transplanting, loosening or weeding grass; drain water promptly after rain; find diseased plants in time to excavate and disperse into lime to disinfect; reduce onset of watering or suspend watering; In the early stage of disease, 72% of agricultural streptomycin-sulfuric acid 3000 times spray is used for prevention and control, sprayed once every 7-10 days, and continuously controlled 2 or 3 times. Second, celery spot blight The main damage leaves. At the onset of the disease, the lesions on the leaves were round or irregular in shape, with sharp edges, yellowish-brown, grayish white centers, and scattered black dots on the center. Severe illness when cold, high humidity, heavy rain, or weak plants. Prevention and control measures: strengthen field management, apply basic fertilizer, reasonably apply fertilizer, and enhance plant resistance to disease; pay attention to cooling and humidity elimination, reduce the temperature difference between day and night, reduce condensation, do not use flood irrigation, can use under-membrane irrigation; Can be sprayed with 5% chlorothalonil dust, 1 kg/mu, 75% chlorothalonil wettable powder 600 times, 60% ethyl phosphonium aluminum wettable powder 500 times, 47% Garrett Agricultural WP 500 times, every 7 to 10 days 1 time, continuous control 2 to 3 times. Third, celery sclerotinia disease The main damage stems and leaves of celery. The victim was initially brownish in water and formed soft rot when the humidity was high. White mycelium was produced on the surface, and black rat sclerotia formed. The sclerotia germination temperature is 5°C～20°C, 15°C is the most suitable, and the disease is easy to occur and prevalence when the relative humidity is above 85%. Control measures: 3 years of rotation; spraying 50% fast-king or 50% acetaminophen or 70% thiophanate-methyl wettable powder 600 times or 50% carbendazim wettable powder 500 times early in the disease. After the onset of disease, 5% chlorothalonil dust was sprayed at 1 kg/mu. Fourth, the virus of the parsley virus The whole plant of celery can be infected with virus disease. The initial leaves were shriveled, showing thick, light green mottled or yellow patches and showed obvious macular mosaic. In severe cases, the leaves of the whole plant do not shrink or yellow or dwarf. Viruses spread in the field mainly through locusts, and they can also be contacted and rubbed by artificial means. Poor cultivation and management conditions, drought, the number of aphids more than the severity of the disease. Preventive measures: Do a good job of prevention and control of locusts, yellow plates can be used to kill; strengthen fertilizer and water management, promote plant growth and robustness, improve plant resistance to disease; spraying foliar spray, can also improve disease resistance; the initial disease spraying 1.5% disease disease spirit Emulsion 1000 times or 20% Virus A WP 500 times. Corn Gluten Meal Fertilizer,Corngerm Cake,Vigoro Corn Gluten Meal,Corn Gluten Meal Crabgrass JILIN COFCO BIO-CHEM AND BIO-ENERGY MARKETING CO., LTD , https://www.cofco-biotech.com