Cymbidium Leaf Spot: Fungal Management with Kocide

Diagnosis

Black leaf spots on cymbidiums that don't wipe off with alcohol are fungal leaf spot—common in this genus. Not contagious to other orchid types.

Treatment Protocol

1. Spray copper-based fungicide (Kocide) on foliage.
2. Repeat every 2 weeks.
3. Reduces new spotting; existing spots remain.
4. Avoid wetting leaves except during spraying.
5. Water droplets can magnify sun, causing burns that invite fungus.

Susceptibility Factors

Some cymbidiums and thin-leaved orchids (e.g., Brassia) are more prone. Cultural management + fungicide provides best control.