Discard rotted bulbs and plant in well drained soil. Avoid wounding plants during the growing season. Dig bulbs carefully to avoid injury. No chemical control is listed. Gray mold causes circular to oval, yellowish to reddish brown spots.
Some spots have light gray centers and dark purple shading to green outer regions.
In wet weather the spots run together blighting the whole leaf. Stems break over at the point of infection. Infected flowers and flower buds are abnormal and brown. The growing point may be killed. Bulb scales may still be used for propagation if dusted with sulfur.