Production of Oxalic Acid by Sclerotium cepivorum during Infection of Onion

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Abstract
S. cepivorum, causal agent of white rot of onion, produced oxalic acid in culture and in infected onion tissue. The concentration of oxalic acid in infected onion sets was 3.3 mg/g initial dry wt of onion tissue by 12 days after inoculation, at which time maceration of the onion sets was essentially complete. Maceration of onions by S. cepivorum may be by synergistic of oxalic acid and endopolygalacturonase, as has been shown in diseases caused by Sclerotium rolfsii and Sclerotinia sclerotiorum.

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