Why does your Anthurium andraeanum Arion have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The presence of tiny black flies in Anthuriums is most commonly due to fungus gnats, whose larvae live in the organic matter of the potting medium and feed on decaying roots and fungi. They are attracted to the consistent moisture levels required by Arion cultivars.
Excessive moisture in the Anthurium substrate creates an ideal breeding ground for fungus gnat larvae and promotes anaerobic conditions. As roots begin to decay, they release gases and organic compounds that attract more flies to the plant.
Anthurium 'Arion' requires high humidity and moisture, but using a substrate that is too heavy in peat moss or decomposing bark provides an abundant food source for fly larvae. The decomposition of this organic matter attracts the adult flies to lay eggs.
Your plant might also be experiencing one of these issues:
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