Why does your Rhododendron satsuki have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnats, whose larvae thrive in the moist, organic-rich soil preferred by Satsuki Azaleas. They feed on decaying organic matter and can damage delicate feeder roots if populations become high.
Satsuki Azaleas require well-draining acidic soil, but constant moisture creates an ideal breeding ground for fungus gnat larvae. High humidity and wet topsoil surfaces are primary drivers for these insect populations.
If the substrate contains large amounts of uncomposted peat or bark, it provides a nutrient-rich food source for insect larvae. As this organic matter breaks down, it attracts moisture-loving pests.
Your plant might also be experiencing one of these issues:
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