Managing Persistent Pests on Microsorum diversifolium (Kangaroo Fern)

A commercial fern grower reports recurring issues with Microsorum diversifolium: Rhizoctonia and thrips treatments provided temporary relief, but stippling on leaves suggests possible mite damage preceding fungal infection. Are mites becoming more common on ferns?

Expert Insights

• Mites on Microsorum are rare in Florida (major fern production area). Typical fern pests: worms, aphids, slugs, scale, mealybugs.
• Thrips and mites are uncommon on ferns generally.
• Microsorum is usually a clean crop; persistent issues suggest an underlying cultural problem.

Recommended Actions

1. Confirm mites with hand lens/microscope examination.
2. If confirmed, treat comprehensively targeting adults and eggs.
3. Submit samples to a diagnostic lab or local extension service for precise ID.
4. Review cultural practices: airflow, watering, sanitation, spacing.

The grower is invited to send plants to the expert's Apopka facility or contact their extension service. ARC Ferns (Florida's largest fern propagator) offers direct consultation.