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Antifungal Activity of Extracts from Fusarium Wilt-Susceptible and -Resistant Tomato Plants. Freddi Hammerschlag, Plant Pathologist, Ornamentals Laboratory, Plant Genetics and Germplasm Institute, ARS, USDA, Beltsville, Maryland 20705; Marshall E. Mace, Plant Pathologist, National Cotton Pathology Research Laboratory, ARS, USDA, P.O. Drawer JF, College Station, Texas 77840. Phytopathology 65:93-94. DOI: 10.1094/Phyto-65-93.

Antifungal activity of extracts from resistant tomato roots was almost twice as great as that from susceptible tomato roots, whether or not the plants were infected with Fusarium oxysporum f. sp. lycopersici. Presumptive chromatographic and bioassay data suggests that the fungitoxicity of the extracts is caused by α-tomatine. The amount of α-tomatine per gram fresh weight of infected wilt-resistant plants was estimated as 180 µg.