Symptoms of Onion Sclerotinia and Control Methods

Sclerotinia is a new disease in the onion nursery in recent years, and the harm is very serious. The incidence of seedling stage begins at the base of the stem, and the diseased part is brownish at the beginning. When the humidity is high, white cotton floc-like mycelium grows, showing a soft rot and no odor. After drying, it is off-white and the mycelium becomes a sclerotia. The disease department shrank and the seedlings died.

Sclerotinia sclerotia mainly sclerotin winter in fields or plastic shed soil. When the ambient temperature and humidity are suitable, the sclerotia germinate, the bacteria spread to the host with the airflow, and invade from the wound and natural holes. The suitable conditions for germination of the bacteria spores are 16-20°C, and the air relative humidity is 95%-100%. The onset is severe when the temperature is low and the humidity is high.

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