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Aerially applied methylcyclohexenone-releasing flakes protect Pseudotsuga menziesii stands from attack by Dendroctonus pseudotsugae
Authors:NE Gillette  CJ Mehmel  JN Webster  SR Mori  N Erbilgin  DL Wood  JD Stein
Institution:1. USDA Forest Service PSW Research Station, Berkeley, CA 94701, United States;2. USDA Forest Service, Forest Health Protection, Wenatchee, WA 98801, United States;3. Total Forestry, Anderson, CA 96007, United States;4. Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2E3, Canada;5. Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720, United States;6. Retired from USDA Forest Service, Forest Health Technology Enterprise Team, Morgantown, WV 26505, United States
Abstract:We tested methylcyclohexenone (MCH), an anti-aggregation pheromone for the Douglas-fir beetle (Dendroctonus pseudotsugae), for protection of Douglas-fir (Pseudotsuga menziesii) stands by applying MCH-releasing polymer flakes by helicopter twice during summer 2006 to five 4.05-ha plots in the State of Washington, USA. Five similar plots served as untreated controls. We assessed D. pseudotsugae flight into study plots using baited pheromone traps, and tallied D. pseudotsugae attack rates on all P. menziesii trees in 2005 and 2006. We also measured stand basal area and incorporated that as an explanatory variable in the analysis. Significantly fewer D. pseudotsugae were trapped in treated plots than in control plots, and significantly fewer P. menziesii trees were attacked in treated plots than in control plots. The attack rate in untreated stands was nearly 10 times that of treated plots, and stands with higher basal area were significantly more likely to be attacked by D. pseudotsugae than were stands of lower basal area. Attack rates in 2006 and 2005 were significantly correlated, regardless of treatment.
Keywords:Pheromones  Bark beetles  Scolytidae  Semiochemicals  Douglas-fir beetle  Scolytinae  Curculionidae
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