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Host Species
Bigleaf Maple - Acer macrophyllum
Cottonwood - Populus trichocarpa
Douglas-fir - Pseudotsuga menziesii
Engelmann Spruce - Picea engelmannii
Grand Fir (Balsam) - Abies grandis
Juniper - Juniperus scopulorum
Lodgepole Pine - Pinus contorta
Mountain Hemlock - Tsuga mertensiana
Ponderosa Pine - Pinus ponderosa
Sitka Spruce - Picea sitchensis
Subalpine Fir - Abies lasiocarpa
Trembling Aspen - Populus tremuloides
Western Hemlock - Tsuga heterophylla
Western Larch - Larix occidentalis
Western Redcedar - Thuja plicata