Pink Hibiscus Mealybug: The Hidden Threat to Pruned Hibiscus

Why Heavy Pruning Triggered This

Severe pruning (5–6 ft to 2 ft) stimulates massive tender regrowth—exactly what pink hibiscus mealybug (Maconellicoccus hirsutus) prefers. This invasive pest injects toxic saliva causing leaves and flowers to shrivel, blacken, and fail to open.

Identification

• White, waxy masses on stems, leaf axils, and undersides.
• Distorted, stunted new growth.
• Sooty mold on honeydew secretions.
• Ants farming the mealybugs.

Management in Florida

1. Biological control: Contact your county extension office. They often release parasitic wasps (Anagyrus kamali) and predatory beetles (Cryptolaemus montrouzieri) at no cost.
2. Horticultural oil: Thorough coverage of stems and leaf undersides suffocates crawlers. Apply in cooler hours.
3. Systemic insecticides: Imidacloprid soil drench provides longer control but harms beneficials. Use as last resort.

Prevention

Avoid heavy pruning during warm months when mealybugs are active. Prune in late winter. Inspect new growth weekly.

This pest is established in Florida—ongoing vigilance and biological control are your best sustainable strategy.