Hibiscus Bud Drop in Southwest Florida: Gall Midge Infestation

A gardener in Southwest Florida reports healthy, deep-green hibiscus plants loaded with buds that never open—instead, the buds dry out and fall off. This classic symptom points to hibiscus gall midge (Contarinia maculipennis), a tiny fly whose larvae feed inside developing buds.

Diagnosis

Split open a few fallen buds; you'll likely find small, white or yellowish larvae inside. The feeding activity causes the bud to yellow, wither, and drop prematurely.

Control Measures

• Cultural: Remove and destroy all fallen buds and any infested buds still on the plant to break the life cycle.
• Chemical: Apply a systemic insecticide labeled for gall midge on hibiscus (e.g., imidacloprid) as a soil drench early in the season. Contact sprays (pyrethroids, spinosad) can target adults but timing is critical.
• Biological: Encourage natural predators like parasitic wasps by avoiding broad-spectrum insecticides.

Local Assistance

Contact your county Extension office for specific product recommendations and timing tailored to Southwest Florida conditions.

With prompt action, you can suppress the midge population and enjoy a full season of hibiscus blooms.