Description: This disease attacks living plants but is often
not noticed until onions are being held in storage.
Sunken, dried areas start appearing at the neck of the
bulb and gradually move down through the entire bulb.
Symptoms usually develop after bulbs have been in storage
for a month or more. The fungus penetrates leaf tissue,
but only affects the bulb. If necks are succulent at
harvest time, they provide an entry point for the fungus.
However, the fungus cannot attack a well-dried neck.
Solution: Do not
apply a nitrogen fertilizer after 8-9 weeks from seeding.
Space plants to allow for good air circulation. A regular
spraying schedule with Soap-Shield® Fungicidal Soap
will reduce infection. (Because of the continual emergence
of new leaves from the neck, timely and thorough spraying
will be required to keep new growth covered.)