Control involves raking and removing any affected plant parts after the tops are killed in the fall. It is also helpful to avoid overhead irrigation and crowding of the plants. When conditions are favorable, applications of fungicides can be made when new growth emerges in the spring. Among the compounds registered for use in Connecticut are chlorothalonil, thiophanate-methyl, iprodione, and mancozeb. Consult the label for dosage rates and safety precautions.
Infected plants fail to flower or blossoms fall off before they open.
Tops may appear water-soaked and collapse. Infected bulbs have a strong odor and are soft and mushy. Since this pathogen is highly contagious, all infected bulbs should be discarded. Bulbs should be planted in well-drained soil and watered early in the day. This disease can also be minimized by avoiding overcrowding and wounding during cultivation.