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Fusarium Basal Plate Rot
(fungus - Fusarium oxysporum f. sp. cepae): The disease develops at the base of the bulb, causing it to become soft. A semi-watery decay progresses from the base of the scales upward [Picture]. The disease may not be noticed until after harvest, when the entire bulb is destroyed. The fungus is soilborne and enters the bulb through wounds, insect injuries or through root scars at the base. High soil temperatures (77-82E F) favor disease development. Losses can be reduced with a 4-year rotation out of onions. Cultivars can also vary in resistance.

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