Pest identification
What's eating my grand fir?
Fir Engraver Beetle (Scolytus ventralis)
Signs: Pitch tubes on trunk, yellowing and browning foliage, cambial galleries causing rapid tree death
Control: Reduce drought stress through mulching and irrigation; remove and destroy beetle-infested trees quickly
Western Spruce Budworm (Choristoneura occidentalis)
Signs: Defoliated new shoots in spring; successive years of attack weaken and kill trees
Control: Bt spray timed to early larval instars; survey pheromone traps to predict outbreak years
Balsam Woolly Adelgid (Adelges piceae)
Signs: Woolly white tufts at stem nodes; gouting and progressive dieback
Control: Horticultural oil or imidacloprid systemic; inspect trees annually in spring
Deer
Signs: Browsed foliage and broken leading shoots on seedlings and young trees
Control: Tree tubes, wire cages, or fencing for young plantings; repellent sprays as a short-term option
Keep grand fir pest-free
Healthy plants resist pests best. Get the basics right:
Grand Fir pests — FAQ
What is eating my grand fir?
Grand Fir is most seriously damaged by bark beetles such as the fir engraver, particularly when trees are drought-stressed or wounded. Western spruce budworm defoliates shoots in outbreak years. Deer browse young trees heavily in Pacific Northwest forests. Woolly adelgids also attack this species. Maintaining tree vigor is the primary defense.
How do I get rid of fir engraver beetle (scolytus ventralis) on grand fir?
Pitch tubes on trunk, yellowing and browning foliage, cambial galleries causing rapid tree death Reduce drought stress through mulching and irrigation; remove and destroy beetle-infested trees quickly
How do I get rid of western spruce budworm (choristoneura occidentalis) on grand fir?
Defoliated new shoots in spring; successive years of attack weaken and kill trees Bt spray timed to early larval instars; survey pheromone traps to predict outbreak years
How do I get rid of balsam woolly adelgid (adelges piceae) on grand fir?
Woolly white tufts at stem nodes; gouting and progressive dieback Horticultural oil or imidacloprid systemic; inspect trees annually in spring
How do I get rid of deer on grand fir?
Browsed foliage and broken leading shoots on seedlings and young trees Tree tubes, wire cages, or fencing for young plantings; repellent sprays as a short-term option