Skip to Main Content
Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.
Laminated root rot in a western Washington plantation: 8-year mortality and growth of Douglas-fir as related to infected stumps, tree density, and fertilization.Author(s): Richard E. Miller; Timothy B. Harrington; Walter G. Thies; Jeff Madsen
Source: Res. Pap. PNW-RP-569. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 37 p
Publication Series: Research Paper (RP)
Station: Pacific Northwest Research Station
View PDF (752 KB)
DescriptionA 4-year-old Douglas-fir plantation in the western Washington Cascades was monitored for 8 years after fertilization with potassium (K), nitrogen (N), and K+N to determine fertilizer effects on rates of mortality from laminated root rot (LRR) and other causes relative to a nonfertilized control. Each element was applied at a rate of 300 lb/acre on and around 0.2-acre plots replicated seven times in a randomized complete block design. Cumulative mortality from LRR did not differ significantly among fertilizer treatments, and losses were strongly related to density of infected stumps from the previous stand (r2 = 0.74). Mortality from disease and other sources accelerated during the 8 years of monitoring. Average tree growth and stand volume were greatest in treatment N and were reduced where N was combined with K. Continued monitoring is needed to identify potential longer term effects of the fertilizer treatments on susceptibility of Douglas-fir to LRR and Armillaria spp.
- 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.
CitationMiller, Richard E.; Harrington, Timothy B.; Thies, Walter G.; Madsen, Jeff. 2006. Laminated root rot in a western Washington plantation: 8-year mortality and growth of Douglas-fir as related to infected stumps, tree density, and fertilization. Res. Pap. PNW-RP-569. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 37 p
- Potassium fertilizer applied immediately after planting had no impact on Douglas-fir seedling mortality caused by laminated root rot on a forested site in Washington State.
- Nitrogen leaching following whole-tree and bole-only harvests on two contrasting Pacific Northwest sites
- Long-term effects of tanoak competition on Douglas-fir stand development
XML: View XML