The leaves of celery in the greenhouse appeared pale yellow water-stained spots, and then a thick layer of white flocculent mycelium grew. Finally, the stem of celery developed a black rat fecal sclerotium, which is a nucleus of celery. The disease is severe in cold, cold, early, and smoggy years.

Characteristics of the disease: Sclerotinia sclerotior can damage the leaves, petioles and stems of celery. Generally, the leaves are firstly infected, with dark stains. When wet, the surface is dense with white mildew. Then spread down to cause the disease of the petiole and stem. The affected part is brown water stain, soft rot is formed when the humidity is high, white hyphae grow on the surface, and finally the stem tissue is rotted and fibrous, and the stem is hollow, forming a black sclerotium of rat feces.

The law of onset: Ascospores spread by wind and rain, infecting the old leaves with weak living conditions, and the leaves with diseased leaves and the strong leaves and stems can spread the mycelium. High temperature and high humidity are conducive to the occurrence and prevalence of the disease. The celery flies or the cruciferous vegetables that are prone to Sclerotinia sclerotiorum are prone to disease. Poor drainage in the rainy season, the incidence of partial nitrogen fertilizer is heavy.

Control method:

1. Agricultural control: It is carried out for more than 3 years. Seed disinfection before sowing, and seed dressing with new high-fat film, can keep warm, moisturize, swell, improve seed germination rate, and make seedlings strong. Repel underground pests and isolate viral infections. It can also be mixed with a seed coating. Timely drainage to reduce field humidity. Timely remove the diseased leaves from the field, concentrate on deep burial, and prevent the spread of pathogens.

2. Drug prevention and treatment: When spraying the targeted fungicide at the initial stage of the disease, it should be used together with the new high-fat film, and continuously controlled 2-3 times to achieve the purpose of combining prevention and treatment.

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