Effects of Grand Fir Monoterpenes on the Fir Engraver, Scolytus ventralis (Coleoptera: Scolytidae), and its Symbiotic Fungus

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Abstract
Monoterpenes present in grand fir, Abies grandis (Douglas) Lindley, phloem were tested for their effects on fir engraver, Scolytus ventralis LeConte, adults and the symbiotic fungus Trichosporium symbioticum Wright. All of the monoterpene vapors caused significant beetle mortality within 4 h. Toxicity was observed at doses normally found in the host tree, either in unattacked phloem or in reaction tissue induced by the pathogen. Incorporation of any monoterpenes into the growth medium, at doses normally found in the host tree, substantially reduced T. symbioticum growth. Limonene was the most inhibitory synthetic compound, but grand fir resin had a greater effect. This suggests that other factors are also involved in fungal inhibition.

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