Why does your Rhododendron molle 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 that Rhododendrons prefer. Their larvae feed on the fine root hairs of the Rhododendron, which can lead to weakened plant vigor and nutrient deficiency.
Excessive moisture in the substrate creates an ideal breeding ground for fungus gnat larvae. For Rhododendron molle, which requires well-draining but moist acidic soil, stagnant water promotes both the flies and potential root rot.
Fungus gnats are attracted to decomposing leaf litter or old potting media. If there is a layer of uncomposted mulch or old organic matter at the base of your Rhododendron, it provides both food and habitat for the flies.
Your plant might also be experiencing one of these issues:
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