Sclerotinia sclerotiorum is a new disease in onion seedlings in recent years, and the damage is very serious. The onset of seedling stage begins at the base of the stem, and the diseased part is brown water-stained at the beginning. When the humidity is high, the white cotton-like hyphae grows, which is soft and rot-like, has no odor, is grayish white after drying, and the mycelium is sclerotia. The diseased department overflowed and the seedlings died.
Sclerotinia sclerotiorum mainly overwinters in the field or plastic shed soil with sclerotia. When the ambient temperature and humidity are suitable, the sclerotia germinates, and the germs pass to the host with the airflow, and invade from the wound and the natural hole. The suitable conditions for the germination of the pathogen are 16-20 ° C, and the relative humidity of the air is 95% to 100%. When the temperature is low and the humidity is high, the disease is serious.
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