Bulbs and shoots below ground are covered with grayish mold. The disease is caused by Sclerotinia sclerotiorum.
Ink spot causes inky black stains on the outer skin of bulb scales.
These are small at first but later cover the entire scale. The fungus moves into bulbs which are blackened on the surface and shrunken and hard on the inside. Destroy diseased bulbs. Blue mold is a storage disease. Mosaic causes the bud sheath to be marked by bluish bulbs.