Why does your Rhododendron prunifolium have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnat adults, which thrive in the consistently moist, organic-rich soil preferred by Rhododendrons. Their larvae feed on organic matter and can damage the delicate feeder roots of Plum-leaf Azaleas.
Excessive soil moisture creates the perfect breeding ground for fungus gnat larvae. For Rhododendron prunifolium, poorly draining soil leads to anaerobic conditions that attract these pests.
Accumulated uncomposted leaf litter or decomposing mulch around the base of the azalea provides both food and habitat for these flies. This is common in acid-loving plants where heavy mulching is practiced.
Your plant might also be experiencing one of these issues:
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