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Chemical attractants for the smaller european elm bark beetleScolytus multistriatus (Coleoptera: Scolytidae)

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The secondary attractant for the smaller European elm bark beetleScolytus multistriatus is a mixture of three compounds: (-)4-methyl-3-heptanol(I); 2,4-dimethyl-5-ethyl-6,8-dioxabicyclo(3.2.1) octane (II); and (−)α-cubebene (III). The novel structure assigned to compound II was confirmed by synthesis. All three compounds were isolated from the volatile compounds collected on Porapak Q by aerating elm bolts infested with virgin female beetles. The GLC fractionations were monitored by two laboratory bioassays. Individually, each compound was inactive in the laboratory bioassays, but a mixture of all three showed activity nearly equivalent to that of the of the original Porapak extract. A mixture of synthetic I and II plus natural III (from cubeb oil) was highly attractive to beetles in preliminary field tests.

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Supported in part by a cooperative research grant to the State University of New York College of Environmental Science and Forestry, State University of New York, Syracuse, New York, from the USDA Forest Service, Northeastern Forest Experiment Station, Upper Darby, Pennsylvania, and from the Elm Research Institute, Harrisville, New Hampshire.

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Pearce, G.T., Gore, W.E., Silverstein, R.M. et al. Chemical attractants for the smaller european elm bark beetleScolytus multistriatus (Coleoptera: Scolytidae). J Chem Ecol 1, 115–124 (1975).

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