Scale and Mealybugs: The Sticky Residue on Your Houseplants

It's Not Fungus – It's Insects

The sticky sap (honeydew) and "white puffy areas" are telltale signs of two sap-sucking insects:

• Scale: Brown/black bumps (1/8–1/4") on leaf undersides and stems. Scrape off with fingernail. Black = dead, brown = alive.
• Mealybugs: White, cottony clusters in leaf axils and stem joints.

Both excrete honeydew, which coats leaves, pots, and furniture.

Effective Treatment Protocol

1. Mix spray: 2 parts rubbing alcohol (70%) + 1 part water + 1 tbsp dish soap per quart.
2. Spray thoroughly – tops/bottoms of all leaves, stems, soil surface – daily for 5 days.
3. Then twice weekly for 3 weeks to catch hatching crawlers.
4. Wipe off dead scale with alcohol-dampened soft cloth.
5. Monitor weekly and retreat immediately if any reappear.

Identifying the "Umbrella" Plant

The 3.5-foot plant with umbrella-like leaf circles is likely a large Schefflera (umbrella tree). Search "Schefflera images" to confirm.

Cleaning Honeydew

Wipe furniture/floors with paper towels soaked in rubbing alcohol – dissolves the sticky residue easily.

Prevention

• Inspect new plants thoroughly before bringing indoors.
• Quarantine 2 weeks.
• Monthly preventive spray with neem oil or insecticidal soap.