Traumatic Resin Ducts as Indicators of Bark Beetle Outbreaks

Authors

R. Justin DeRose, Utah State UniversityFollow
Matthew F. Bekker, Brigham Young University
James N. Long, Utah State UniversityFollow

Document Type

Article

Journal/Book Title/Conference

Canadian Journal of Forest Research

Volume

47

Issue

9

Publisher

Canadian Science Publishing

Publication Date

6-5-2017

Funder

Utah State University

First Page

1168

Last Page

1174

Abstract

The formation of traumatic resin ducts (TRDs) represents an important induced defense in woody plants that enhances oleoresin production and flow in response to environmental perturbations. In some genera (Pinus), resin ducts are copious and conspicuous; however, in others (Picea), resin ducts are relatively rare. The occurrence and strength of resin ducts, in particular TRDs, in annually resolved rings could be used to reconstruct mechanical damage associated with natural disturbances. We analyzed tree-ring data from paired live and dead Engelmann spruce (Picea engelmannii Parry ex Engelm.) that recently experienced a spruce beetle outbreak. The presence of TRDs, defined as resin ducts aligned tangentially and arranged compactly, indicated mechanical damage associated with epidemic spruce beetle (Dendroctonus rufipennis (Kirby)) populations. TRD prevalence during the outbreak was significantly higher than over tree lifespans. All other metrics characterizing tree vigor (diameter, age, ring width, and basal area increment) were not significantly different between live and dead trees, suggesting that the inherent capability to produce TRDs that can “pitch out” attacking spruce beetles could be the primary mechanism by which Engelmann spruce survived the outbreak. Because TRD production in our Engelmann spruce was exceedingly rare, this discovery represents a new line of tree-ring-based evidence that can be used to reconstruct other spruce beetle outbreaks.

Recommended Citation

DeRose,R.J.,M.F. Bekker, and J.N. Long. 2017. Traumatic resin ducts as indicators of bark beetle outbreaks. Canadian Journal of Forest Research47:1168-1174.