Allelochemicals produced by invasive plant, camphorweed and assessment of its adaptation in Japan

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Camphorweed (Heterotheca subaxillaris, Asteraceae) is widdely distributed in U.S., and this plant have a camphor-like odor without damage from phytophagous insect. The reason of defense system was investigated and a few sesquiterpenes showed insect antifeedant activity against a worm. Additionally, the pot test in Japan using collected in MS.U.S. was investigated that change of constituents with plant development. When this plant will invade in Japan, the spread of this will be limited, because the defense system can not be effective in Japanese habitat.