Scale Insects on ficus
What's Happening
Scale insects (Coccidae family) appear as immobile brown or white bumps attached to stems, leaf veins, and undersides. These sap-sucking pests secrete a protective waxy covering that shields them from contact insecticides. Unlike mealybugs which have cottony coatings, scale forms hard shell-like coverings. Heavy infestations cause yellowing, leaf drop, and sooty mold from honeydew excretion. Scale spreads slowly but is difficult to eradicate once established on stems.
How to Fix It
- 1
Confirm scale identification: Use fingernail or blunt knife to gently scrape—scale will detach as single unit; mealybugs will smudge
- 2
For light infestations: Scrape off individual scale insects with fingernail, dull knife, or cotton pad soaked in 70% isopropyl alcohol
- 3
For moderate infestations: Apply systemic insecticide (imidacloprid) as soil drench—chemical travels through plant tissue to kill feeding scale
- 4
Apply horticultural oil or neem oil thoroughly, ensuring contact with all surfaces. Repeat every 10-14 days for 4-6 applications
- 5
For severe infestations: Prune and discard heavily infested branches. Treat remaining plant aggressively
- 6
Monitor for 6-8 weeks—scale has long life cycle and may require multiple treatment cycles
How to Prevent It
Inspect new plants thoroughly, especially stems and leaf undersides. Maintain plant vigor with proper light and water—stressed plants are more susceptible. Prune dense growth to improve airflow and visibility for early detection. Apply preventive neem oil sprays monthly during growing season. Quarantine new plants for 2-3 weeks.