Woolly Aphids or Mealybugs on Pentas: Diagnosis and Malathion Treatment

Woolly Aphids or Mealybugs on Pentas: Diagnosis and Malathion Treatment

Pentas attacked by white bugs (spider-like and stick-like). Leaves turning black, white stuff on plant.

Spider-like bugs

Stick-like bugs

Identification

• Woolly aphids (most likely): White, waxy filaments; suck sap; produce honeydew → sooty mold (black leaves).
• Mealybugs (close second): Cottony, oval, segmented; also suck sap.

Control

1. Malathion: Contact/organophosphate insecticide. Effective on both. Follow label strictly.
2. Confirm ID at garden center: Bring bagged sample for verification.
3. Treat all nearby pentas to prevent spread.

Organic Alternative

Neem oil + horticultural oil mix, sprayed weekly ×3–4. Safer for beneficials.

Sooty mold will fade once insects are gone.