Skip to Main Content
How to identify brooms in Douglas-fir caused by dwarf mistletoe.Author(s): Robert O. Tinnin; Donald M. Knutson
Source: Res. Note PNW-RN-426. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
View PDF (860 KB)
DescriptionDwarf mistletoe causes obvious brooms in Douglas-fir. The brooms are the easiest means of recognizing the presence of dwarf mistletoe; however, dwarf mistletoe is not the only cause of brooming in Douglas-fir. Therefore, accurate identification of dwarf mistletoe brooms is important. If no evidence of aerial shoots can be found in the brooms, and if the brooms occur infrequently, are all relatively small, or are found only in trees where a stand has been opened, then dwarf mistletoe is probably not the cause of brooming. Dwarf mistletoe brooms generally have aerial shoots present and are found in stands where brooms of various sizes are common.
Three different types of dwarf mistletoe brooms can be identified in Douglas-fir. Each may affect host trees in different ways, but all are detrimental.
- 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.
CitationTinnin, Robert O.; Knutson, Donald M. 1985. How to identify brooms in Douglas-fir caused by dwarf mistletoe. Res. Note PNW-RN-426. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p
Keywordsbroom damage, dwarf mistletoe, Arceuthobium douglasii, disease symptoms, Douglas-fir, Pseudotsuga menziesii
- Dwarf mistletoe-infected red fir: growth after release
- Dwarf mistletoe in red and white firs in California–23 to 28 years after inoculation
- Stem infection by dwarf mistletoe in California firs
XML: View XML