White Spots on Cymbidium? Likely Scale—Act Fast

Transplanting five Cymbidiums, one has white, rub-off spots on pseudobulbs. Hard water? Unlikely. This screams scale insects.

Immediate Treatment

1. Isolate the plant immediately—scale spreads fast.
2. Wipe every spot with 60% isopropyl alcohol on cotton swab/cloth.
3. Check all other plants for similar spots.
4. Spray with insecticide labeled for scale (e.g., Bonide "Eight"). Roots too.
5. Let dry 24 hours before repotting.
6. Discard old pot & mix in sealed plastic bag.

Post-Repot Protection

• If new growth present, add granular systemic insecticide to fresh mix.
• Wear gloves when handling treated plants.

Why Not Hard Water?

Hard water leaves crusty, mineral deposits—usually on pots, not rub-off spots on pseudobulbs. Scale insects secrete a waxy coating that wipes off as powder.

Catch it early, treat thoroughly, and your Cymbidium collection stays clean.