Biology
Basal rots of onion, garlic, and related species are caused by fungi. Affected plants are yellowed, wilted, and grow poorly. Reddish discoloration may be present on affected garlic, while onions may show a red-brown rot beginning where roots are attached to the bulb at the basal plate. Initial infection typically occurs on the roots or the basal plate. The rot progresses upward through the bulb and can also occur in stored infected bulbs when sufficient moisture is present. Plants attacked by onion maggots or other insects are more likely to be infected.
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