Why does your Rhododendron degronianum have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The larvae of fungus gnats thrive in the consistently moist, organic-rich substrate preferred by Rhododendron degronianum. They feed on fungal mycelium and can damage delicate root hairs, potentially leading to secondary rot.
While not a direct cause of flies, poor drainage that attracts gnats can lead to anaerobic conditions. This stresses the Yakushima Azalea, making it more susceptible to pests that thrive in decaying organic matter.
Small, dark beetles may be attracted to the decomposing organic matter in the acidic peat-based soil used for Yakushima Azaleas. While adults are pests, the primary concern is often their larvae feeding on root structures.
Your plant might also be experiencing one of these issues:
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