Western dwarf mistletoe parasitizing Colorado blue spruce and Norway spruce in California

Robert L Mathiasen, J. R. Allison, B. W. Geils

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Abstract

Western dwarf mistletoe (Arceuthobium campylopodum Engelm.), a common parasite of ponderosa pine (Pinus ponderosa Dougl. ex Laws.) and Jeffrey pine (Pinus jeffreyi Grev. & Balf.), was found parasitizing planted Colorado blue spruce (Picea pungens Engelm.) and Norway spruce (Picea abies (L.) H. Karsten) in Upper Cuddy Valley, CA (Kern County, T. 9 N., R. 21 W., Sec. 25). One tree greater than 6 m in height of each spruce species was infected and both trees were within 12 m of a Jeffrey pine severely infected with western dwarf mistletoe. Five to 10 branches were infected on each tree and a few of these had abundant mistletoe shoot production, which allowed identification of the parasite. This is the first report of western dwarf mistletoe on Colorado blue spruce. Although this is the first report of natural infection of Norway spruce in California, this mistletoe/host combination has been reported by Weir from artificial inoculation (2) and collected by Russell in central Washington (1). We recommend that these spruce species not be planted within 15 m of pines infected with western dwarf mistletoe. Specimens of western dwarf mistletoe on Colorado blue spruce and Norway spruce were collected and deposited at the Deaver Herbarium, Northern Arizona University, Flagstaff.

Original languageEnglish (US)
Pages (from-to)351
Number of pages1
JournalPlant Disease
Volume82
Issue number3
DOIs
StatePublished - 1998

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Santalales
Picea pungens
Picea abies
parasitism
Pinus jeffreyi
Pinus ponderosa
Picea
Arceuthobium
parasites
herbaria
valleys
Pinus
shoots

ASJC Scopus subject areas

  • Plant Science
  • Agronomy and Crop Science

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Western dwarf mistletoe parasitizing Colorado blue spruce and Norway spruce in California. / Mathiasen, Robert L; Allison, J. R.; Geils, B. W.

In: Plant Disease, Vol. 82, No. 3, 1998, p. 351.

Research output: Contribution to journalArticle

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