During the summer solstice, the average temperature is between 25 ° C and 30 ° C, exceeding the temperature requirement of 20 ° C to 25 ° C of celery, coupled with heavy rain, resulting in a humid microclimate, celery leaf spot is highly prevalent. Its symptoms are: yellow leaf spots on the leaves, leaves gradually dry, stems rot, brown wet rot on the roots, heart leaves also begin to rot, the damage is more serious. The prevention and control technology is now introduced as follows. Use resistant varieties: such as American Ventura celery. Suitable sowing: The suitable sowing date in Huaibei area is in early February, and the other areas are subject to local farming conditions. Timely transplanting: 35-45 days of seedling age. If the seedling age is too small, the growth is weak, the seedling period is long, and it is not easy to survive. Reasonable close planting: line spacing 20 cm, plant spacing 4 cm. Strengthen water and fertilizer management: celery is like big fat and water, often keep the soil between the plants moist, the ground should be leveled, and the horse water should be poured. Each time you water the water, you must apply urea and potassium dihydrogen phosphate to promote the seedlings and resist pests and diseases. Use shading net for management: celery is resistant to yin, using shade net can make celery grow under suitable light conditions, and can lower the temperature and make celery grow normally. Chemical control: The celery is treated with 65% sensitized zinc 2000 times solution, or chlorothalonil and methyl thiophanate 1500 times solution.
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