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Title: Aerially applied methylcyclohexenone-releasing flakes protect Psuedotsuga menziesii stands from attack by Dendroctonus pseudotsugae

Author: Gillette, N. E.; Mehmel, C. J.; Webster, J. N.; Mori, S. R.; Erbilgin, N.; Wood, D. L.; Stein, J. D.

Date: 2009

Source: Forest Ecology and Management, 257(4): 1231-1236

Publication Series: Journal/Magazine Article (JRNL)

Description: 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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Gillette, N. E.; Mehmel, C. J.; Webster, J. N.; Mori, S. R.; Erbilgin, N.; Wood, D. L.; Stein, J. D. 2009. Aerially applied methylcyclohexenone-releasing flakes protect Psuedotsuga menziesii stands from attack by Dendroctonus pseudotsugae.. Forest Ecology and Management, 257(4): 1231-1236

 


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