Why does your Rhododendron alabamense 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 matter found in Rhododendron potting media. Their larvae feed on fungal mycelia and fine feeder roots, which can lead to root damage and decreased vigor in Alabama Azaleas.
While not the flies themselves, chronic overwatering creates the damp, anaerobic conditions that trigger fungus gnat outbreaks. For Rhododendron alabamense, which requires well-draining acidic soil, excess moisture leads to substrate degradation and insect attraction.
A high concentration of decomposing peat or compost in the azalea's pot provides an ideal breeding ground and food source for small dipterans. The flies are attracted to the carbon dioxide and humidity released during the breakdown of organic nutrients.
Your plant might also be experiencing one of these issues:
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