White rot—Sclerotium cepivorum
Leaves of infected plants show yellowing, leaf dieback, and wilting. Leaf decay begins at the base, with
older leaves being the first to collapse. A semiwatery decay of the bulb scales results. Roots also rot.
A fluffy white growth develops around the base of the bulb. As the disease progresses, this mycelium becomes
more compacted, less conspicuous, with numerous small spherical black bodies forming.
Life cycle
SolutionsThe most effective controls for white rot are avoidance and sanitation. Use of raised beds and careful
furrow irrigation can help limit damage. Space plants well enough to allow for good air circulation. Destroy
diseased plants. To prevent spread in soil, do not compost. Do not replant onions or garlic in that area;
fungus survives in soil for years. Solarization will help control this disease.
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Yellowing
and wilting of infected onions |
