Why does your Rhododendron keleticum have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The presence of tiny black flies in Rhododendron containers is most often due to fungus gnats, which breed in the moist organic matter of the potting medium. Their larvae feed on fungal mycelium and can damage the delicate fine feeder roots of the Keleti rhododendron.
Rhododendrons require acidic, well-draining soil; however, if the medium remains saturated, it creates a perfect breeding ground for moisture-loving insects. Constant wetness can also lead to Phytophthora root rot in this species.
If the potting mix contains uncomposted bark or heavy peat that is actively decomposing, the resulting fungal growth attracts gnats. This decomposition process can temporarily alter the pH levels critical for Rhododendron health.
Your plant might also be experiencing one of these issues:
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