It was observed that three kinds of fluorescent glycosides (FG-l, FG-2, and FG-3) were more abundantly accumulated in Taphrina wiesneri-infected cherry (Prunus yedoensis) stems than in healthy ones. The contents of FG-1, FG-2, and FG-3 in infected stems were, re-spectively, 2.7, 7.2, and 4.3 times those in healthy stems. In dryed infected stems, FG-1, FG-2, and FG-3, amounted respectively to 0.005, 0.18, and 0.12% in the bark part; and to 0.003, 0.048, and 0.008% in the wood part.
FG-l was isolated in crystalline form, and was identified with gentisic acid-5-β-D-gluco-pyranoside by the comparison of its chemical and physical properties with those of synthesized gentisic acid-5- or 2-β-D-glucopyranoside.

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