Scientific name Coriandrum sativum L. Alias ​​Hu Wei, parsley, Xiang Hong, Yan Yan and so on. Is an annual or biennial herb of the Umbelliferae family. Use whole plants and mature fruits as medicine. Has the effect of releasing rash and stomach. It is cultivated everywhere.
Symptoms of seedlings, adults can be disease. The main damage stems, from the stem base began to appear water-like soft rot, causing the seedlings to collapse dead; adult plants can support a few days. When the humidity is high, the diseased department gives birth to luxuriant cotton-like white hyphae, which spreads to the surrounding healthy plants and causes diseased tissues to rot. In the later period, black murine-like hard sclerotia formed between mycelia. The disease is odorless when it rots, unlike the soft rot of E. coli.
The pathogen Sclerotinia sclerotiorum (Lib.) de Bary is called Sclerotinia sclerotiorum, belonging to the genus Ascomycotina.
Transmission routes and conditions Sclerotia are left in the soil, or mixed in the seeds for winter or summer. The sclerotia mixed in the seeds enters the field with the sowing of diseased seeds, or the sclerotia remains in the soil, where the appropriate conditions of temperature and humidity result in the germination of the production of the ascendant sac, the release of ascospores, and the wind blows onto the wounds of the weakened plants. After the germination, it causes initial infection. The mycelium produced by the disease minister extends to neighboring plants or re-infected by direct contact with diseased plants, causing morbidity and repeated infection in this manner until the conditions deteriorate and bacteria are formed. The nucleus falls into the soil or mixes with the plant into the seed for winter or summer. The occurrence of disease in the south from April to April and from November to December is more frequent in the north from March to May. The bacteria require high water content. The relative humidity is higher than 85%, and the temperature is 15-20°C, which is conducive to the germination of sclerotia and the growth of mycelia, invasion, and the production of the apium disc. Therefore, early spring or late autumn with low temperature, high humidity or multiple rains is beneficial to the occurrence and prevalence of the disease, with a short sclerotia and a large number of sclerotia. Planting celery, cucurbitaceae, solanaceous, and cruciferous vegetables in successive years, low-lying land with poor drainage, or partial application of nitrogen fertilizer or frostbite, and severe frostbite. In addition, the planting period has a certain impact on the incidence.
Prevention methods (1) Three-year rotation. (2) Select seeds from disease-free plants or use 10% saline before planting, remove sclerotia and rinse with clean water, and dry them by sowing. (3) Appropriate close planting and timely removal of weeds. (4) Try to reduce the humidity in the shed or in the field, find the diseased plants in a timely manner, and bring them out of the field to burn them in order to reduce the formation of sclerotia. Immediately after harvest, deep soaked or soaked or soaked in water for 7-10 days, high temperature was used to kill surface sclerotia. (5) Covering with plastic film to stop the emergence of the ascidian plate and reduce the incidence. (6) Adopt ecological control methods to avoid the occurrence of disease conditions. (7) In the initial stage of onset of spraying, 5% quick keratin or 50% acetaminophen or 50% nellikon wettable powder 1000-1500 times or 70% thiophanate-methyl WP 600 times, 50% more Bacillin WP 500 times, 60% anti-mildew treasure ultrafine powder 600 times, 20% methyl-Like phosphorus emulsifiable concentrate l000 times, 667m2 spray good liquid 60L, every 8-9 days, continuous Prevention 3-4 times. (8) The sheds and rooms are planted with wilting and used with 15% procymidone or 45% chlorothalonil smoke agent, 250g per 667m2, smoked 1 night, every 8-10 days, continuously or with Other methods alternately prevent and treat 3-4 times. Such as spraying 5% chlorothalonil dust agent, lkg per 667m2. The drug was stopped 7 days before harvest.
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