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Douglas-fir beetle (Coleoptera: Curculionidae) response to single-point-source 3-methylcyclohex-2-en-1-one (MCH) releasers

Published online by Cambridge University Press:  18 December 2020

Darrell W. Ross Open the ORCID record for Darrell W. Ross [Opens in a new window]  and
Brian T. Sullivan
Darrell W. Ross*
Affiliation:
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, Oregon, 97331, United States of America
Brian T. Sullivan
Affiliation:
United States Department of Agriculture Forest Service, Southern Research Station, Pineville, Louisiana, 71360, United States of America
*
*Corresponding author. Email: [email protected]
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Abstract

The Douglas-fir beetle (Dendroctonus pseudotsugae Hopkins) (Coleoptera: Curculionidae) antiaggregation pheromone, 3-methylcyclohex-2-en-1-one (MCH), has been used since 2000 to protect high-value trees and stands throughout western North America. Operational treatments involve placing individual releasers on a 12 m × 12 m grid throughout the area to be protected. In this study, six widely spaced trap lines were established with aggregation attractant–baited traps located 1, 3, 9, 27, and 81 m from a location where an operational MCH release device was alternately either present or absent, and changes in catches caused by the MCH device were assessed at all distances. Trap catches were suppressed by about 70% at one and three metres, by 50% at nine metres, by 30% at 27 m, and not at all at 81 m. Inhibition by the MCH device varied with distance (m) from the source according to the function 0.79 − 0.092x0.51 (R2 = 0.986). Decline of attractant inhibition with distance from the MCH device was much less steep than would have been expected if catch inhibition had varied directly with the average airborne concentration of MCH.

Type
Research Papers
Information
The Canadian Entomologist , Volume 153 , Issue 2 , April 2021 , pp. 150 - 156
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Copyright
© The authors and the United States Department of Agriculture, 2020. To the extent this is a work of the United States Government, it is not subject to copyright protection within the United States of America. Published by Cambridge University Press on behalf of the Entomological Society of Canada

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Footnotes

†

Present address: Department of Entomology, School of Natural Resource Sciences, College of Agriculture, Food Systems, and Natural Resources, North Dakota State University, Fargo, North Dakota, 58108, United States of America

Subject editor: Jon Sweeney

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