Historical patterns of western spruce budworm and Douglas-fir tussock moth outbreaks in the northern Blue Mountains, Oregon, since AD 1700

T. W. Swetnam, B. E. Wickman, P. H. Gene, C. H. Baisan

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Dendroecology methods were used to reconstruct a three-century history of western spruce budworm Choristoneura occidentalis and Douglas-fir tussock moth Orgyia pseudotsugata outbreaks in the Blue Mountains of NE Oregon. Budworm outbreaks were more confidently reconstructed than were tussock moth outbreaks. Since AD 1700, at least eight regional budworm outbreaks have occurred at intervals of about 21 to 53 yrs. Reduced radial growth caused by defoliation lasted from about 13 to 17 yrs. Two regional budworm outbreaks occurred during the 19th century, and at least three and possibly four regional outbreaks have occurred during the 20th century. -from Authors

Original languageEnglish (US)
JournalResearch Paper - US Department of Agriculture, Forest Service
Issue numberPNW-RP-484
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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