Hibiscus Caterpillar or Mealybug? Identifying and Treating the Pest

White Webs and Leaf Damage on Hibiscus: Mealybugs, Not Caterpillars

The user saw "white web" and small caterpillars eating leaves. The follow-up clarified: mealybugs (cottony masses), not caterpillars or slugs.

Effective Treatment: Horticultural Oil

1. Spray thoroughly in late afternoon.
2. Next morning, rinse off oil and dead insects with strong water jet.
3. Repeat if needed.

Critical Timing

Never leave oil on foliage in direct sun—it acts as a magnifying glass and burns leaves. Always rinse the next morning before temperatures rise.

Ongoing Vigilance

Mealybugs hide in leaf axils and under bark. Inspect weekly and treat at first sign.