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Title: Limber Pine Dwarf Mistletoe (FIDL)

Author: Taylor, Jane E.; Mathiason, Robert L.;

Date: 1999

Source: Forest Insect & Disease Leaflet 171. [Missoula, MT:] U.S. Dept. of Agriculture, Forest Service, Forest Health Protection, Northern Region.

Publication Series: Forest Insect and Disease Leaflet (FIDL)

Description: Limber pine dwarf mistletoe (Arceuthobium cyanocarpum (A. Nelson ex Rydberg) Coulter & Nelson) is a damaging parasite of limber pine (Pinus flexilis James), whitebark pine (P. albicaulis Engelm.), Rocky Mountain bristlecone pine (P. aristata Engelm.) and Great Basin bristlecone pine (P. longaeva D.K. Bailey). Limber pine dwarf mistletoe occurs in the Rocky Mountains from southern Montana to southern Colorado and Utah. It also occurs in widely scattered populations in the Great Basin (southern Idaho, western Utah and Nevada), and in the southern Sierra Nevada Mountains (Figure 1). Several isolated populations are reported for this dwarf mistletoe, including one in the central Cascade Mountains of Oregon (west of Bend), in northern California (Mount Shasta area), and in the San Bernardino and San Jacinto Mountains of southern California (Figure 1). This dwarf mistletoe causes severe mortality of limber pine in many areas of the Rocky Mountains and whitebark pine on the northwest slopes of Mount Shasta, CA. Because of its widespread occurrence on limber and whitebark pines, and the high level of mortality it causes, limber pine dwarf mistletoe is considered to be one of the most important diseases of high-elevation 5-needle pines in the West. Only white pine blister rust (Cronartium ribicola Fisch.) is considered more damaging.

Keywords: Parasite, decline, mortality.

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Taylor, Jane E.; Mathiason, Robert L. 1999. Limber Pine Dwarf Mistletoe (FIDL). Forest Insect & Disease Leaflet 171. [Missoula, MT:] U.S. Dept. of Agriculture, Forest Service, Forest Health Protection, Northern Region.


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