Xanthomonas campestris pv. Avoid overhead irrigation. Rot Few leaves emerge in the spring. Leaves are yellowed, turn brown, and die. Gray masses of fungal spores form on infected leaf tissue.
Rhizomes have a dry, mealy rot.
Botrytis convoluta Do not plant infected rhizomes. Destroy infected plants. Crown Rot Leaves die slowly from the tips. White fungal threads can be found at the leaf bases. Corticium rolfsii Discard infected bulbs.