Canadian Forest Service Publications
Predicting Douglas-fir defoliation from the percentage of buds infested by the western spruce budworm. 1988. Shore, T.L.; Alfaro, R.I. Journal of the Entomological Society of British Columbia 85: 21-25.
Issued by: Pacific Forestry Centre
Catalog ID: 2759
Availability: PDF (request by e-mail)