Cattleya New Growth Turning Black: Fungus on Sheaths and Leaves

Black New Leaves and Sheaths = Fungus from Night Moisture

A Cattleya with black-spotted new leaves and sheaths, good roots, no flowers.

Cause

Water on sheaths/leaves overnight → fungus. Water mornings only.

Light Deficit

Medium green leaves = too little light for blooming. Needs 4–6 hours direct sun (summer) for lighter green leaves and flowers.

Treatment

• Remove blackened tissue with sterile cuts.
• Water mornings, bright light, air movement.
• Physan 20 can help as a fungicide/bactericide—follow label.

Fix the culture, and this plant will bloom.