Why does your Rhododendron indicum have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist, organic-rich soil preferred by Japanese Azaleas. Their larvae feed on decaying organic matter and can damage delicate azalea feeder roots.
Excessive moisture in azalea pots creates the perfect breeding ground for fungus gnat larvae. Since Rhododendron indicum requires well-draining, acidic soil, waterlogged conditions lead to both insect infestation and potential root rot.
While typically larger, some species of weevils can be mistaken for small flies in early stages; their larvae are notorious for eating the root systems of acid-loving plants like azaleas.
Your plant might also be experiencing one of these issues:
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