Botrytis on Cymbidium Flowers: Prevention and Quick Action

Identifying the Spots

For the second year, a white cymbidium develops black/brown spots on its blossoms while neighboring plants remain clean. The spots appear rapidly and are almost certainly Botrytis, a fungal disease that thrives in cool, damp, dark conditions—especially overnight.

Immediate Treatment

As soon as a spot appears, wipe it gently with a cotton swab or paper towel dampened with rubbing alcohol. If caught within 24 hours, the stain can often be removed before it sets permanently. Botrytis spores land in water droplets on petals and explode overnight.

Prevention Strategies

• Water and mist only in the morning so all moisture evaporates before nightfall.
• Ensure light air movement around plants— a small fan works well.
• Remove spent flowers promptly to reduce inoculum.
• Accept that light-colored blooms, especially white, are most susceptible.

Botrytis is manageable with cultural habits. No chemical spray is needed if the environment is kept dry at night.