In recent years, coriander sclerotinia disease has become a major obstacle in the production of parsley as the area for cultivation of coriander has continued to expand, especially for crop rotation in protected areas, where bacteria have accumulated and become more and more serious. First, symptom recognition Coriander sclerotia mainly affects the stem base, followed by the leaves. At the beginning, there was a fading, watery, spotted lesion that later turned pale brown and quickly expanded. Around the circumference of the stem, when the humidity was high, the diseased part had white cotton-like hyphae, which was soft and rot-like, and later it was under the white mold layer. The mycelia form a black sclerotia and when severe, the diseased seedlings die. Identification points: When wet, the surface of the diseased part has a white layer of cotton wool, and a sclerotia is formed on the surface of the stem at the later stage, or black sclerotia are seen on the surface of the stem. Second, the law of occurrence Pathogenic bacteria The coriander sclerotinia disease is caused by the infection of the sclerotium of the genus Ascomycota sclerotiorum. The mycelium is white, the sclerotia is black outside and the interior is white. When the sclerotia germinates, it will produce ascites disks, many of which can reach dozens, usually 3-10. The appressus was cup-shaped at first, then disc-like, pale yellow-brown, with a long handle under the disk. The ascus capsule is arranged on the surface of the ascitic sac, which is rod-shaped and contains 8 ascospores. 2. Infection cycle The bacterium sclerotia is overwintering in the soil or mixed with seeds, becoming the source of infection in the second year. When conditions are appropriate for a leap year, the sclerotia germinates, producing an ascendant plate, ejecting ascospore spores, and spreading it through the airstream. After invading the host, it is reinfested by the hyphae in the field. The field can also be transmitted to the parsley through sclerotia (such as purslane) and repeatedly infected. When the conditions deteriorate, the bacteria form sclerotia and overwinter. 3. Incidence conditions (1) The relationship between onset and temperature and humidity The germ temperature is 0-30°C, the optimum temperature is about 20°C, and the relative humidity is more than 85%, which is conducive to the development of germs. Therefore, S. sclerotiorum in the protected areas in winter and spring, where the temperature is relatively low and humidity is high, is severe. (2) Relationship between onset and soil moisture The sclerotia had a short survival time in water, and sclerotia died in 1 month. Therefore, sclerotia can survive for about 1 year in relatively moist soils, and more than 3 years in dry soils. It can be seen that the soil has high humidity and is not conducive to the survival of sclerotia and the incidence is reduced. (3) The relationship between onset and other vegetables Sclerotinia can cause damage to almost all vegetables. Hosts include cabbage, lettuce, celery, cucumber, tomato, eggplant, beans, fennel, and cabbage. After the occurrence of Sclerotinia in these vegetables, there are sclerotia in the soil. Planting parsley can infect the disease. (4) The relationship between the disease and the seed If the sclerotia are mixed in the seed, the sclerotia will enter the vegetable field with the sowing, and the disease will infect the parsley. Standard tits? Do you like a Midium chest sex doll?, sure! we have all kinds of dolls and all boobs sizes.
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