The tissues become moist and slimy. Under severe conditions the entire top may be killed. Infected corms have irregularly shaped sclerotia attached to them. Affected corms should be discarded. Use suggested fungicides for controlling the disease on above-ground plant parts.
Spots turn red.
Caused by the bean yellow mosaic virus. Produces angular light and dark green mottling of leaves and flower stems. Virus is transmitted by aphids. Flower parts remain green and fail to form normal color pigment. Plants turn yellow and degenerate prematurely.