Pest identification
What's eating my japanese cedar 'cristata'?
Cryptomeria scale
Signs: Armored scale colonies on crested fasciated growth and normal stems; yellowing needles; dieback of affected fans
Control: Horticultural oil spray in late winter and early summer; physically remove infested crested growth if heavily affected; improve air circulation around the plant
Spider mites
Signs: Bronze discoloration and webbing in the interior of crested shoots; needle drop in severe infestations
Control: Keep plant well watered in dry weather; apply miticide or neem oil spray; water jet to physically remove mites
Bark beetles
Signs: Entry holes and resin on weakened stems; dieback particularly in crested sections that accumulate moisture
Control: Prune out and destroy infested crested growth; avoid waterlogging or bark wounds; no curative spray once inside
Keep japanese cedar 'cristata' pest-free
Healthy plants resist pests best. Get the basics right:
- What eats japanese cedar bonsai — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Common japanese cedar 'cristata' problems & fixes
- Japanese Cedar 'Cristata' watering schedule
- Japanese Cedar 'Cristata' light requirements
- Full japanese cedar 'cristata' care guide
Japanese Cedar 'Cristata' pests — FAQ
What is eating my japanese cedar 'cristata'?
Cryptomeria japonica 'Cristata' (cockscomb cedar) produces fasciated, fan-like crested growths that can trap moisture and debris, increasing vulnerability to scale insects and fungal diseases. Scale is the most serious pest threat. Spider mites may appear in dry summers. Remove dead or infected crested growth promptly and apply horticultural oil as a preventive treatment.
How do I get rid of cryptomeria scale on japanese cedar 'cristata'?
Armored scale colonies on crested fasciated growth and normal stems; yellowing needles; dieback of affected fans Horticultural oil spray in late winter and early summer; physically remove infested crested growth if heavily affected; improve air circulation around the plant
How do I get rid of spider mites on japanese cedar 'cristata'?
Bronze discoloration and webbing in the interior of crested shoots; needle drop in severe infestations Keep plant well watered in dry weather; apply miticide or neem oil spray; water jet to physically remove mites
How do I get rid of bark beetles on japanese cedar 'cristata'?
Entry holes and resin on weakened stems; dieback particularly in crested sections that accumulate moisture Prune out and destroy infested crested growth; avoid waterlogging or bark wounds; no curative spray once inside