Simultaneous Infestation by Dwarf Mistletoe and Western Spruce Budworm Decreases Growth of Douglas-fir in the Blue Mountains of Oregon

One-hundred paired branches, half with dwarf mistletoe plants and half without, were sampled from 100 Douglas-fir in five stands defoliated by the western spruce budworm. The budworm completely defoliated new shoots and buds of all branches sampled including those infected by dwarf mistletoe. Radial growth of host trees (Douglas-fir) was significantly less during the budworm outbreak compared with a similar period before the outbreak. Nonhost trees (ponderosa pine) showed significantly more radial growth during the outbreak than before it. Regression analyses showed that decreases in radial growth were associated primarily with increases in dwarf mistletoe severity (R² = 16.2-18.1). Trees within all dwarf mistletoe infection classes were defoliated by the budworm, and the additional growth reduction caused by defoliation was not significantly different among dwarf mistletoe severity classes. For. Sci. 33(3):767-773.

• Publication year

  1987

• Venue

  Forestry sciences

• Publication date

  1987-09-01

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1093/FORESTSCIENCE/33.3.767
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

• No references are available for this paper.

• Dwarf mistletoe affects whole-tree water relations of Douglas fir and western larch primarily through changes in leaf to sapwood ratios

  2017cites this paper
• Pruning high-value Douglas-fir can reduce dwarf mistletoe severity and increase longevity in Central Oregon

  2016cites this paper
• Chapter 8: Simulating mortality from forest insects and diseases

  2004cites this paper
• Effects of the mistletoe Tristerix aphyllus (Loranthaceae) on the reproduction of its cactus host Echinopsis chilensis

  1996cites this paper
• The relationship of Douglas-fir dwarf mistletoe (Arceuthobium douglasii) to environmental and stand conditions and plant communities in the southern Oregon Cascades

  1995cites this paper
• Associations of Armillaria Root Disease in Jack Pine with Arceuthobium Americanum

  1995cites this paper
• Influence of Dwarf Mistletoe and Western Spruce Budworm on Growth and Mortality of Douglas-Fir in Unmanaged Stands

  1993cites this paper