E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Choristoneura occidentalis Freeman, 1967
Western Spruce Budworm
Family: Tortricidae
Once images have been obtained, photographs of this taxon will be displayed in this window.Click on the image to enter our photo gallery.
No E-Fauna image is available for this taxon.
E-Fauna BC Static Map
Distribution of Choristoneura occidentalis in British Columbia
Details about map content are available here.


The Western Spruce Budworm is a widespread destructive Nearctic moth species in western North America that feeds on coniferous trees. It is found in :the Rocky Mountains from Arizona and New Mexico northward into Colorado, Utah, Wyoming, Montana, and Idaho; in the Pacific Northwest in Oregon and Washington; and in British Columbia and Alberta, Canada" (US Department of Agriculture Forest Service 1992).

"The first recorded western spruce budworm outbreak was in 1909 on the southeastern part of Vancouver Island in British Columbia, Canada. Since that year, infestations of this and related species frequently have been reported in western Canada" (US Department of Agriculture Forest Service 1992).

Host tree species include: Douglas-fir (Pseudotsuga menziesi), grand fir (Abies grandis), subalpine fir (Abies lasiocarpa), Engelmann spruce (Picea engelmannii), white spruce (Picea glauca), and western larch (Larix occidentalis)

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
NativeSNRNo StatusNot Listed
BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Choristoneura freemani

Additional Photo Sources

General References

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2021. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2022-09-24 9:13:55 AM]
Disclaimer: The information contained in an E-Fauna BC atlas pages is derived from expert sources as cited (with permission) in each section. This information is scientifically based.  E-Fauna BC also acts as a portal to other sites via deep links.  As always, users should refer to the original sources for complete information.  E-Fauna BC is not responsible for the accuracy or completeness of the original information.

© E-Fauna BC 2021: An initiative of the Spatial Data Lab, Department of Geography, UBC