Pest identification
What's eating my white fir?
Western Spruce Budworm (Choristoneura occidentalis)
Signs: Defoliation of new shoots in spring; repeated attacks over several years can kill trees
Control: Apply Bt (Bacillus thuringiensis var. kurstaki) during young larval stage; monitor with pheromone traps
Fir Bark Beetles (Scolytus ventralis and related spp.)
Signs: Pitch tubes and resin flow on bark; cambium galleries cause branch dieback and tree death
Control: Prevent drought stress; remove and chip or burn infested material promptly; avoid injuries to bark
Cinara Aphids
Signs: Large brown aphids on bark and shoots producing heavy honeydew and sooty mold; weakened trees
Control: Blast with water; apply insecticidal soap or horticultural oil; natural predators (lacewings, parasitic wasps) help
Deer
Signs: Browsed foliage and broken leading shoots on young plants
Control: Tree guards or wire cages on young plants; repellent sprays on foliage
Keep white fir pest-free
Healthy plants resist pests best. Get the basics right:
White Fir pests — FAQ
What is eating my white fir?
White Fir is most commonly damaged by the western spruce budworm and bark beetles in drought-stressed trees. Cinara aphids colonize bark causing sooty mold. Deer browse young trees. In garden settings, twig aphids and spider mites can disfigure foliage. Keeping trees well-watered reduces vulnerability to bark beetle attack.
How do I get rid of western spruce budworm (choristoneura occidentalis) on white fir?
Defoliation of new shoots in spring; repeated attacks over several years can kill trees Apply Bt (Bacillus thuringiensis var. kurstaki) during young larval stage; monitor with pheromone traps
How do I get rid of fir bark beetles (scolytus ventralis and related spp.) on white fir?
Pitch tubes and resin flow on bark; cambium galleries cause branch dieback and tree death Prevent drought stress; remove and chip or burn infested material promptly; avoid injuries to bark
How do I get rid of cinara aphids on white fir?
Large brown aphids on bark and shoots producing heavy honeydew and sooty mold; weakened trees Blast with water; apply insecticidal soap or horticultural oil; natural predators (lacewings, parasitic wasps) help
How do I get rid of deer on white fir?
Browsed foliage and broken leading shoots on young plants Tree guards or wire cages on young plants; repellent sprays on foliage