Phalaenopsis Scale Infestation: Hard to Eradicate, Repot and Treat

Two Phalaenopsis: clusters of elevated spots (yellow sap drops hardening) on leaf undersides and blooms. Flick off when hard. Multiplying, one plant overtaken. Fungus? Mites?

Likely Scale Insects

Very difficult once established in large colonies.

Aggressive Treatment

1. Unpot, remove all media.
2. Remove visible scales.
3. Treat whole plant (roots too) with Ortho Rose Defense (follow label).
4. Repot in NEW pots and media—don't reuse old.

Vigilance

Phalaenopsis attract scale/mealies like magnets. Check undersides constantly.