Skip to Main Content
Douglas-fir tussock moth- and Douglas-fir beetle-caused mortality in a ponderosa pine/Douglas-fir forest in the Colorado Front Range, USAAuthor(s): Jose F. Negron; Ann M. Lynch; Willis C. Schaupp; Vladimir Bocharnikov
Source: Forests. 5: 3131-3146.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
View PDF (563.85 KB)
DescriptionAn outbreak of the Douglas-fir tussock moth, Orgyia pseudotsugata McDunnough, occurred in the South Platte River drainage on the Pike-San Isabel National Forest in the Colorado Front Range attacking Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco. Stocking levels, species composition, and tree size in heavily and lightly defoliated stands were similar. Douglas-fir tussock moth defoliation resulted in significant Douglas-fir mortality in the heavily defoliated stands, leading to a change in dominance to ponderosa pine, Pinus ponderosa Lawson. Douglas-fir beetle, Dendroctonus pseudotsuqae Hopkins, populations increased following the defoliation event but caused less mortality, and did not differ between heavily and lightly defoliated stands. Douglas-fir tussock moth-related mortality was greatest in trees less than 15 cm dbh (diameter at 1.4 m above the ground) that grew in suppressed and intermediate canopy positions. Douglas-fir beetle-related mortality was greatest in trees larger than 15 cm dbh that grew in the dominant and co-dominant crown positions. Although both insects utilize Douglas-fir as its primary host, stand response to infestation is different. The extensive outbreak of the Douglas-fir tussock moth followed by Douglas-fir beetle activity may be associated with a legacy of increased host type growing in overstocked conditions as a result of fire exclusion.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationNegron, Jose F.; Lynch, Ann M.; Schaupp, Willis C., Jr.; Mercado, Javier E. 2014. Douglas-fir tussock moth- and Douglas-fir beetle-caused mortality in a ponderosa pine/Douglas-fir forest in the Colorado Front Range, USA. Forests. 5: 3131-3146.
KeywordsOrgyia pseudotsugata, Dendroctonus pseudotsugae, douglas-fir tussock moth, douglas-fir beetle, forest insects, defoliators, bark beetles
- Price projections for selected grades of Douglas-fir, coast hem-fir, inland hem-fir, and ponderosa pine lumber.
- Machining ponderosa pine and Douglas fir: effect of growth rate and density
- Effects of fire exclusion on forest structure and composition in unlogged ponderosa pine/Douglas-fir forests
XML: View XML