The hot water extractives from steam-treated Japanese larch wood were studied to understand the chemical properties of attractive factors of the treated wood to feeding behavior of a subterranean termite, Coptotermes formosanus. Hot water extractives were fractionated and analyzed using chromatography, gel filtration, and NMR methods. The stimulants yielded by the steam treatment were comprised of phenolics and saccharides, which were highly polar constituents. In addition, the stimulative effect was possibly accelerated by the degradation of flavonoids such as taxifolin originally included in untreated larch wood.

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