Pest identification
What's eating my korean fir?
Fir Adelgid (Adelges spp.)
Signs: Woolly white tufts on needles and young shoots; gall formation, needle drop, and shoot dieback
Control: Apply horticultural oil in early spring; remove galled shoots; systemic insecticide for persistent infestations
Spruce / Fir Scale (Physokermes and related spp.)
Signs: Small brown waxy bumps on twigs; yellowing needles and reduced vigour
Control: Dormant oil spray before bud break; prune and discard heavily infested branches
Spider Mites (Oligonychus ununguis)
Signs: Stippled, dull, or bronze-colored needles; fine webbing on shoots in summer
Control: Increase humidity; blast with water; apply miticide or insecticidal soap, avoiding during peak heat
Deer
Signs: Browsed foliage and broken leading shoots, especially damaging on slow-growing dwarf forms
Control: Wire cage or spiral guard; repellent sprays on foliage during winter months
Keep korean fir pest-free
Healthy plants resist pests best. Get the basics right:
Korean Fir pests — FAQ
What is eating my korean fir?
Korean Fir, popular as a garden ornamental for its purple cones, is attacked by fir adelgids and scale insects on its stems. Deer browse young trees. Spider mites can disfigure needles in hot, dry summers. Its compact dwarf forms are particularly susceptible to root disturbance from vine weevil larvae in containers.
How do I get rid of fir adelgid (adelges spp.) on korean fir?
Woolly white tufts on needles and young shoots; gall formation, needle drop, and shoot dieback Apply horticultural oil in early spring; remove galled shoots; systemic insecticide for persistent infestations
How do I get rid of spruce / fir scale (physokermes and related spp.) on korean fir?
Small brown waxy bumps on twigs; yellowing needles and reduced vigour Dormant oil spray before bud break; prune and discard heavily infested branches
How do I get rid of spider mites (oligonychus ununguis) on korean fir?
Stippled, dull, or bronze-colored needles; fine webbing on shoots in summer Increase humidity; blast with water; apply miticide or insecticidal soap, avoiding during peak heat
How do I get rid of deer on korean fir?
Browsed foliage and broken leading shoots, especially damaging on slow-growing dwarf forms Wire cage or spiral guard; repellent sprays on foliage during winter months