Black Dots and Fungus Gnats in Phalaenopsis Pots

Decayed Potting Mix Causes Fungus Gnats and Spore Buildup

Black, poppy-seed-like dots on pots and leaves, plus small flying insects, indicate degraded potting mix harboring fungal spores and fungus gnats.

Solution: Repot in Fresh Mix

1. Remove plant; rinse roots thoroughly.
2. Discard old mix (bag and seal).
3. Trim mushy (dead) roots; keep firm, green-when-wet roots.
4. Repot in fresh fir-bark-based orchid mix in a clean, well-drained pot.
5. Sift out fine dust; soak mix before use to reduce bark hydrophobicity.

Why This Works

Fresh, open mix restores air flow and drainage, eliminating the moist, decaying conditions that favor gnats and spores. The insects don’t directly harm the plant, but their habitat leads to root rot.