Why does your Phalaenopsis Aberdeen have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely Fungus Gnats, whose larvae thrive in the moist organic matter of orchid bark. They feed on decaying roots and fungi, often appearing when the Phalaenopsis substrate remains too wet for too long.
High levels of moisture in the bark or sphagnum moss create the perfect breeding ground for pests. For a Phalaenopsis, this prevents the roots from 'breathing,' leading to stagnant water that attracts flies.
As orchid bark breaks down over time, it turns into a fine, nutrient-rich compost that attracts flies. Old potting media becomes much more prone to infestations than fresh, chunky bark.
Your plant might also be experiencing one of these issues:
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