Why does your Dendrobium nobile have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe larvae of these flies live in the organic matter of the orchid medium, feeding on decaying roots and fungal mycelium. Their presence indicates that the Dendrobium substrate is staying too wet for too long, creating a perfect breeding ground.
While not the fly itself, stagnant moisture in bark or sphagnum moss allows fungus gnat larvae to thrive and promotes root decay. Dendrobium nobile requires a distinct drying cycle between waterings to prevent this environment.
Accumulated dead organic matter, such as old, decomposed bark or moss, provides the primary food source for the fly larvae. As the medium breaks down into a finer, more compact texture, it attracts more pests.
Your plant might also be experiencing one of these issues:
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