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.
Climate and growth rate as related to an outbreak of silver fir beetles.Author(s): Gerard M. Thomas
Source: PNW Old Series Research Notes No. 150, p. 1-4
Publication Series: Scientific Journal (JRNL)
Station: Pacific Northwest Research Station
PDF: View PDF (210 KB)
DescriptionIn 1947, an outbreak of silver fir beetles, Pseudohylesinus grandis Sw. and P. granulatus (Lec.), was discovered in northwestern Washington. The epidemic flourished for the next six years, killing some 525 million board-feet of Pacific silver fir, Abies amabilis (Dougl.) Forbes. Prior to 1947, the silver fir beetles were considered to be of little economic importance because they had been observed to attack only slash, windthrows, and suppressed or otherwise weakened trees. While the recent destructive outbreak was in progress, it was reasoned that some factor or factors might have weakened the trees sufficiently so that these relatively non-aggressive beetles could kill them. Climate was suspected as a factor in weakening the trees. A study was undertaken, therefore, to determine whether a relationship existed between tree growth and weather patterns before and during the beetle outbreak.
- You may send email to email@example.com 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.
CitationThomas, Gerard M. 1957. Climate and growth rate as related to an outbreak of silver fir beetles. PNW Old Series Research Notes No. 150, p. 1-4
- Distinct genecological patterns in seedlings of Norway spruce and silver fir from a mountainous landscape
- Detecting changes in tree health and productivity in silver fir-beech forests of Slovenia
- Outbreak of Zeiraphera rufimitrana on silver fir hitherto unknown in southwest Germany
XML: View XML