True to its name, this fungal disease causes onion necks to shrivel and turn brown and soft inside. Although infection occurs while plants are in the field, the disease may not become apparent until bulbs are in storage, when a gray, powdery mold appears in the dry outer skin. Neck rot usually leads to other diseases, such as soft rot, which will destroy bulbs in storage.
White onions are usually more susceptible to neck rot than yellow or red onions. Wet weather and poorly-drained soil favors development of this disease.
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