Why does your Phalaenopsis Belem have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The larvae of these flies live in the orchid substrate and feed on organic matter and decaying roots. In Phalaenopsis, they thrive in overly moist sphagnum moss or bark media, often causing secondary damage to delicate root hairs.
If there is decomposing organic matter nearby, such as overripe fruit or fermenting orchid fertilizer residue, these flies may be attracted to the pot area.
These tiny flies can target tender new growth in orchids. While less common than fungus gnats, they seek out high-humidity microclimates within the orchid's leaf axils or crown.
Your plant might also be experiencing one of these issues:
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