Effects of <script type="text/javascript"> var wmNotice = "UNT Web Archive - External links, forms, and search boxes may not function within this collection. Url: http://www.treesearch.fs.fed.us/pubs/25069 time: 20:04:16 Jan 15, 2009"; var wmHideNotice = "hide"; var contextRoot = "https://webarchive.library.unt.edu/eot2008/"; </script> <script type="text/javascript" src="https://webarchive.library.unt.edu/eot2008/js/disclaim.js"></script> <em>Arceuthobium americanum</em> on twig growth of <em>Pinus contorts</em>.

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Title:	Effects of Arceuthobium americanum on twig growth of Pinus contorts.
Author(s):	Broshot, Nancy; Larsen, Lynn; Tinnin, Robert.
Date:	1986
Source:	Res. Note PNW-RN-453. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p
Station ID:	RN-PNW-453
Description:	Patterns of branch growth in Pinus contorts Dougl. ex Loud, (lodgepole pine) on the east side of the Cascade Range in Oregon were significantly altered by Arceuthobium americanum (lodgepole pine dwarf mistletoe). There were decreases in the number, length, and mass of needles, as well as in the length and mass of twigs. These reductions were correlated with the infection status of individual branches. Generally, twigs from uninfected branches supported the greatest number, size, and mass of needles, as well as the greatest twig mass. Twigs from branches having localized infections were intermediate for these same characteristics, whereas twigs from systemically infected branches were lowest. These differences suggest that changes in metabolic function of the host result from infection by dwarf mistletoe. The changes are probably among the factors that contribute to host decline correlated with increases in severity of infection.
Keywords:	Parasites (plant), forest damage, dwarf mistletoe, Arceuthobium americanum, lodgepole pine, Pinus contorta
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Citation

Broshot, Nancy; Larsen, Lynn; Tinnin, Robert. 1986. Effects of Arceuthobium americanum on twig growth of Pinus contorts.. Res. Note PNW-RN-453. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p

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Last Modified: January 12, 2009