Why does your Rhododendron kaempferi have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely the larvae or adults of fungus gnats, which thrive in the moist, organic-rich soil that Rhododendron kaempferi prefers. Their larvae feed on organic matter and can damage delicate feeder roots if populations become high.
Excessive moisture in the substrate creates the perfect breeding ground for fungus gnat larvae. For Pincushion Azaleas, soggy soil also risks causing Phytophthora root rot, which often accompanies high fly populations.
High concentrations of decomposing peat or bark in the azalea mix provide a food source for flies. As organic matter breaks down in the acidic medium, it releases gases and nutrients that attract these insects.
Your plant might also be experiencing one of these issues:
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