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Douglas - fir beetle in British Columbia

By N. Humphreys

Introduction

The Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.) is an important native pest throughout the range of its principal host, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). Western larch (Larix occidentalis Nutt.) is also occa-sionally attacked. Damage caused by this beetle has been most extensive in the interior of British Columbia. Tree vol-ume losses from 1956 to 1994 were estimated at about 2 403 000 m 3 ; ninety percent of this mortality occurred in the interior of the province.

For more information, see the Douglas - fir beetle in British Columbia Forest Pest Leaflet in the Canadian Forest Service bookstore.