Mountain Pine Beetle
All pine's in region
Excessive Pitch and Boring dust visible

Douglas-fir Beetle
Douglas-fir
Boring dust visible

Western Pine Beetle
Ponderosa pine
Pitch and boring dust visible

Pine Engraver
All pine's in region
Boring dust visible

Fir Engraver
Grand Fir
Boring dust visible

Douglas-fir Engraver
Douglas-fir
Mortality in regen, Top-kill

Douglas-fir Tussock Moth
All Firs in region and Engelmann Spruce
Top-kill, foliage loss

Western Spruce Budworm
All Firs in region, Western Larch, and Engelmann Spruce
Top-kill, foliage loss

Spruce Beetle
Engelmann Spruce
Needle change from yellow to red
Red/brown boring dust

Sawflies
All Firs and Pines in region, and Western Larch
Foliage loss

Pine Butterfly
Ponderosa Pine
Foliage loss

Larch Casebearer
Western Larch
Needle discoloration

Hemlock Looper
Hemlocks
Foliage discolored

Western Balsam Bark Beetle
Subalpine Fir, Grand Fir
Typically group attacks present