Stilbenic components, one of polyphenolic groups, widely distributed in plant bodies have been known as anti-microbial agents, but not known whether to have anti-termite activities. A stilbene glucoside, isorhapontin, from the bark of Picea glehnii was examined on the anti-feedant activity against a subterranean Reticulitermes speratus. Isorhapontigenin, the aglycone of isorhapontin, induced from it by hydrolysis using ß-glucosidase was also tested for comparison. From the results of choice and no choice feeding tests using paper disks, anti-feedant activity was shown in both the compounds. Isorhapontigenin had a larger anti-feedant activity than isorhapontin.

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