Why does your Cymbidium faberi have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely fungus gnat adults, which lay eggs in the moist organic matter of the Cymbidium potting medium. The larvae feed on decaying plant material and can damage the delicate fine roots of the orchid if populations become high.
Frequent overwatering or a lack of drainage in the Cymbidium bark mix creates a perfect breeding ground for fungus gnat larvae. High humidity levels around the base of the orchid also attract adult flies to lay eggs.
As orchid bark and sphagnum moss decompose, they create a nutrient-rich environment for fly larvae. If the medium is old, it may be too decomposed, providing the exact food source these flies require.
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