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    Author(s): E. Matthew Hansen; A. Steven Munson; Darren C. Blackford; Andrew D. Graves; Tom W. Coleman; L. Scott Baggett
    Date: 2017
    Source: Journal of Economic Entomology. doi: 10.1093/jee/tox208.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (2.0 MB)

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    RMRS-2017-199
    Semiochemical repellents reduce spruce beetle infestations

    Description

    We tested 3-methylcyclohex-2-en-1-one (MCH) and an Acer kairomone blend (AKB) as repellent semiochemicals for area and single tree protection to prevent spruce beetle (Dendroctonus rufipennis Kirby) attacks at locations in Utah and New Mexico. In the area protection study, we compared host infestation rates of MCH applications at three densities (20, 40, and 80 g MCH ha-1) against a control treatment over 0.64 ha plots centered within ~1.25 ha treatment blocks. All treatments included two baited funnel traps within the plot to assure spruce beetle pressure. Following beetle attack, plots were surveyed for new spruce beetle attacks and to quantify stand characteristics. The probability of more severe spruce beetle attacks was significantly reduced, by ~50%, in each of the MCH area treatments compared with the control treatment but there was no significant treatment difference among the MCH deployment densities. For the single tree protection study, we compared attack rates of MCH, Acer kairomone blend (AKB), and MCH plus AKB on spruce beetle-baited trees against bait-only trees. Each treatment was applied over a range of host diameters to test for host size effects. Seventy-five percent of control trees were mass-attacked, about one-third of MCH- and AKB-alone spruce was mass-attacked, and no MCH plus AKB spruce were mass-attacked. These results suggest that MCH alone is a marginal area and single tree protectant against spruce beetle but that deployment with other repellents can significantly increase treatment efficacy.

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    Citation

    Hansen, E. Matthew; Munson, A. Steven; Blackford, Darren C.; Graves, Andrew D.; Coleman, Tom W.; Baggett, L. Scott. 2017. 3-Methylcyclohex-2-en-1-one for area and individual tree protection against spruce beetle (Coleoptera: Curculionidae: Scolytinae) attack in the southern Rocky Mountains. Journal of Economic Entomology. doi: 10.1093/jee/tox208.

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    Keywords

    pheromone, bark beetle management, Dendroctonus rufipennis, semiochemicals, Engelmann spruce

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