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Carbohydrate Specificity for Fusaric Acid Synthesis. David Davis, Research Associate, The New York Botanical Garden, Bronx, New York 10458. Phytopathology 60:111-113. Accepted for publication 12 August 1969. DOI: 10.1094/Phyto-60-111.

Fusaric acid is not produced by Fusarium oxysporum ff. sp. conglutinans, dianthi, lycopersici, niveum, or vasinfectum on Richard’s medium containing pectin, polypectate, or carboxy-methylcellulose as the sole carbon source. Large quantities are produced on 2% glucose, but only trace amounts on 0.05% glucose. Since the fluids in vessel elements of tomato, for example, contain no more than 0.01% combustible solids, and since cell-wall constituents cannot be used for fusaric acid synthesis, it is probable that the xylem parenchyma is the major source of nutrient for fusaric acid synthesis.