Pest identification
What's eating my bismarck palm?
Scale insects
Signs: Hard or soft bumps clustered along frond midribs and petioles; frond discoloration and sticky residue.
Control: Apply horticultural oil to all frond surfaces in spring; treat with systemic imidacloprid drench for persistent infestations.
Palm aphids (Cerataphis brasiliensis)
Signs: Dark flat colonies on leaflet undersides; sooty mold obscures the ornamental silver coloring.
Control: Wash off with a strong water stream; spray insecticidal soap or neem oil every 7-10 days.
Thrips
Signs: Silvery scarring and distortion on unfurling spear leaves.
Control: Spray new growth with spinosad; remove and dispose of the most heavily damaged spear if the infestation is severe.
Keep bismarck palm pest-free
Healthy plants resist pests best. Get the basics right:
Bismarck Palm pests — FAQ
What is eating my bismarck palm?
Bismarck Palm (Bismarckia nobilis) is a large outdoor tropical palm whose primary pest concerns are scale insects and palm aphids on its striking silver fronds. Thrips can scar new growth. In frost-free gardens slugs occasionally target transplants. Deer rarely bother the coarse fronds but may investigate young palms.
How do I get rid of scale insects on bismarck palm?
Hard or soft bumps clustered along frond midribs and petioles; frond discoloration and sticky residue. Apply horticultural oil to all frond surfaces in spring; treat with systemic imidacloprid drench for persistent infestations.
How do I get rid of palm aphids (cerataphis brasiliensis) on bismarck palm?
Dark flat colonies on leaflet undersides; sooty mold obscures the ornamental silver coloring. Wash off with a strong water stream; spray insecticidal soap or neem oil every 7-10 days.
How do I get rid of thrips on bismarck palm?
Silvery scarring and distortion on unfurling spear leaves. Spray new growth with spinosad; remove and dispose of the most heavily damaged spear if the infestation is severe.