Spider Mites on Schefflera (Umbrella Plant): Identification and Control

A large, decade-old Schefflera arboricola (Hawaiian umbrella plant) with white, spider-web-like spots likely has a spider mite infestation. These tiny arachnids thrive in dry indoor air and cause stippling, webbing, and leaf drop.

Confirming Spider Mites

• Tap a branch over white paper — moving specks = mites.
• Look for fine webbing on leaf undersides and between stems.
• Leaves may show yellow/bronze stippling.

Treatment Plan

Immediate (indoors):

• Spray plant thoroughly with insecticidal soap or neem oil, covering all surfaces, especially leaf undersides. Repeat every 5–7 days for 3–4 weeks.
• Increase humidity — mist daily, use a pebble tray, or run a humidifier. Mites hate moisture.
• Wipe leaves with a damp cloth to physically remove mites and webbing.

Long-term (when moved outdoors in spring):

• Apply a systemic insecticide labeled for spider mites on ornamental plants (e.g., imidacloprid or abamectin formulations). Only apply outdoors.
• Follow label rates and timing strictly.
• Continue monitoring weekly.

Note: Topical sprays on a 6-foot specimen are impractical for full coverage. Systemic treatment outdoors is the most effective solution for large plants. Always check local regulations and pollinator safety.