Why does your Dendrobium victoriae reginae have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist, organic-rich media preferred by Dendrobium victoriae reginae. Their larvae live in the substrate and feed on organic matter and decaying root tissue, potentially causing secondary rot.
Frequent moisture retention in the orchid bark or sphagnum moss provides the perfect breeding ground for gnats. For this species, if the medium stays damp for too long without drying out between waterings, it promotes fungal growth that attracts pests.
Old, decomposing orchid bark or fallen leaves in the Dendrobium pot provide the nutrient source for pest larvae. As the media breaks down into a finer, more compost-like consistency, it becomes an ideal nursery for flies.
Your plant might also be experiencing one of these issues:
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