A Soft Rot of Onion Caused by the Yeast Kluyveromyces marxianus var. marxianus

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Abstract
The yeast Kluyveromyces marxianus var. marxianus isolated from onion (Allium cepa L.) bulbs showing soft rot symptoms from commerical fields, a cull pile, and packinghouse was confirmed as a soft rot pathogen of onion bulbs by completing Koch''s postulates. Resultant soft rot symptoms were significantly (P=0.05) more severe at 27 and 20 C than at 10 or 5 C. Decay was significantly (P=0.05) less in bulbs injected with 1 ml of 90 and 1,000 yeast cells per milliliter than bulbs inoculated with 11,000 or more yeast cells per milliliter. This is the first report known to us of a true yeast being pathogenic to onion bulbs.

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