Pest identification
What's eating my california fan palm?
Scale insects
Signs: Armored bumps and sticky honeydew on fronds; frond yellowing and premature drop.
Control: Apply horticultural oil in spring and summer; use imidacloprid systemic drench for large trees.
Palm leaf skeletonizer (Homaledra sabalella)
Signs: Webbed, brown, papery leaflet tissue; caterpillars hide in protective silk tunnels.
Control: Spray Bacillus thuringiensis (Bt) or spinosad on infested fronds; remove the worst fronds and dispose off-site.
Aphids
Signs: Clustered insects on new growth; leaves curl and become sticky with honeydew.
Control: Blast off with water; apply insecticidal soap or neem oil spray; natural predators usually keep populations down.
Keep california fan palm pest-free
Healthy plants resist pests best. Get the basics right:
California Fan Palm pests — FAQ
What is eating my california fan palm?
California Fan Palm (Washingtonia filifera) shares the outdoor pest profile of W. robusta — scale insects, the palm leaf skeletonizer caterpillar, and aphids are most common. In native desert settings, the persistent dead-frond skirt also shelters rodents and insects. Deer occasionally browse young transplants. Scale is the primary pest concern.
How do I get rid of scale insects on california fan palm?
Armored bumps and sticky honeydew on fronds; frond yellowing and premature drop. Apply horticultural oil in spring and summer; use imidacloprid systemic drench for large trees.
How do I get rid of palm leaf skeletonizer (homaledra sabalella) on california fan palm?
Webbed, brown, papery leaflet tissue; caterpillars hide in protective silk tunnels. Spray Bacillus thuringiensis (Bt) or spinosad on infested fronds; remove the worst fronds and dispose off-site.
How do I get rid of aphids on california fan palm?
Clustered insects on new growth; leaves curl and become sticky with honeydew. Blast off with water; apply insecticidal soap or neem oil spray; natural predators usually keep populations down.