Douglas-fir oleoresin and the terpene hydrocarbons (alpha-pinene, beta-pinene, litnonene, camphene, geraniol, and alpha-terpineol) attracted various bark and timber beetles associated with Douiglas-fir forests during their flight. In responding to these volatile terpenes the bettles are directed to favorable breeding material.
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J. A. Rudinský (1966) studied this question.
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