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The methanol extract of Phellodendron amurense bark was shown to have a strong antifeedant activity against Reticulitermes speratus. The extract was sequentially partitioned with hexane, chloroform, ethyl acetate and water, and the activity was observed in both the chloroform and water fractions. The active principles isolated from the chloroform fraction were obacunone and kihadanin A, while those from the water fraction were berberine chloride and palmatine iodide.

Several antifeedants from Phellodendron amurense against Reticulitermes speratus.