First, the occurrence of celery leaf spot disease 1, field disease symptoms celery leaf spot disease, also known as early blight. When the plants are victimized, they first develop disease at the leaf margin and petiole and gradually spread to the entire leaf. After the leaves are damaged, they appear yellowish-green water stain spots, and later develop into a round or irregular shape. The lesion size is 2-15 mm, and the gray-brown The edge color is slightly deeper, and the internal yellowishness is relatively thin. It is not limited by the veins. In severe cases, lesions expand to form plaques, eventually causing the entire leaves to yellow and die. The lesions on the stems or petioles were oval in shape. The lesions ranged in size from 3 to 23 millimeters and began to yellow. They gradually became gray-brown depressions, and the stems were cracked. In severe cases, the stems contracted and lodging, and they rotted during high humidity. At the later stage of disease, the gray and white mold layer grows on the leaf surface of the leaves, which are the conidiospores and conidia of the pathogen. The pathogenic bacteria were caused by C. cerevisiae, a genus of C. cerevisiae. The primary source of infection is mainly seeds or residual diseased plants. For non-epidemic areas, carriers of bacteria are the only source of primary infection. The celery leaf spot caused by the mycelium attached to the surface of the seed and into the seed coat and the residual diseased plant and soil in the winter of mycelium and spores, in the next year in the appropriate temperature and humidity conditions, produce new conidia, through the rain splash, Wind and agricultural implements or agricultural operations spread to the plants, directly invading from the stomata or epidermis, germinating and infesting, and continuing through to the end of autumn. 2. Incidence conditions The disease is suitable for the temperature of 22 ~ 30 °C, relative humidity of 85%. Conidia formation temperature 15 ~ 25 °C, germination suitable temperature 28 °C. High temperature, rain, and low-lying areas are prone to disease, but it is also prone to onset when exposed to high temperature and drought and condensation at night. In addition, there are serious shortages of fertilizer, excessive irrigation, or weak plants. ? 3, the incidence of field celery leaf spot disease in the seedling stage, adult stage can be the disease, the more serious damage to adult plants, mainly stems and leaves. In the Lanzhou area, celery leaf spot disease is mainly diarrhea, and from July to September, it is the peak period of disease. Second, comprehensive prevention and control technology? 1, the selection of disease-resistant varieties currently imported from abroad Gaoyou it, California King, Ventura, Bailey celery, tender and other varieties resistant to disease. ? 2, seed treatment? (1) warm soup soaking. Put the seeds into warm water of 50°C and stir continuously so that the seeds will be heated evenly. After soaking seeds for 25 minutes, put them into cold water to dissipate heat immediately. (2) Seed soaking. Chemicals are used before sowing to kill or inhibit the surface of the seeds and germs lurking inside the seed coat. Can be soaked with 50% Formamide WP 600 times for 50 minutes, then rinse with clean water or dry to direct sowing. 3. Clean the diseased leaves, leaves and leaves in the early stage of the gardening disease. After the harvest, remove the diseased plant debris, centralize the destruction and deep burial, combined with deep-turning the land to reduce the source of infection. At the same time, more than two years of rotation will greatly reduce the number of pathogens. 4. Cultivate strong nursery seedlings (beds) and production sites. Thoroughly remove the diseased body and conduct soil disinfection before nursery. Seed sowing in the cloudy or late evening, avoid high temperature, sow planted water before sowing, and then fill in low-lying areas with fine soil, to prevent the emergence of uneven or weak plants, to cultivate disease-free strong seedlings. 5. Rationally fertilize celery with shallow roots. After harvesting, 3,000 kg of fertilized manure is applied per acre, or 1000 kg of excrement is poured into the acquaintance. In combination with deep-turning land, flattening is done to provide better plant growth. Conditions to enhance the resistance of celery. 6, the field management of celery colonization slow seedling fertilizer and water to promote plant growth. Winter and spring production shed temperature difference between day and night, long time condensation at night, easy to disease, pay attention to insulation and cold, reduce the temperature difference between day and night, prevent condensation, summer and autumn high temperature and rain, pay attention to drainage, water irrigation, to prevent the product inside water. Protected areas should enhance ventilation and reduce humidity. 7. spraying spraying 50% thiophanate-methyl wettable powder 500 times, or 40% polysulfide suspension 800 times, or 77% killing wettable powder 500 times, or 50% Renon wettable powder 400 to 500 times every 7 to 10 days, continuous medication 2 or 3 times. Under the protective conditions, 5% chlorothalonil dust can be used. Each kilogram of drug is used for 1 kilogram each time and 9 to 11 days. Or apply 45% chlorothalonil smoke agent, 200-250 grams per acre, about 9 days 1 time, continuous or alternating application of 2 or 3 times.
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