Why does your Cymbidium erythraeum have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The larvae of these flies live in the organic matter of the potting medium and feed on decaying roots or fungi. Frequent overwatering of Cymbidium orchid bark creates the moist, aerobic environment they need to thrive.
These flies are attracted to the high humidity levels required by Cymbidium erythraeum. Their presence often indicates that the orchid bark is staying damp for too long, which can also lead to secondary root rot.
While not a direct 'cause' of the flies, the breakdown of orchid bark into fine, compost-like material provides an ideal breeding ground for pests. As the medium loses aeration, it attracts moisture-loving insects.
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