leaf discoloration

[jean2]

Reason maybe Pythium and Phytophthora. This disease spreads rapidly and will kill the plant unless treated promptly. Cattleya show a creamy yellow discoloration on one or both sides of the pseudobulbs. The discoloration eventually turns black or brown and softens, and the bulb rots.

Unless the plant is valuable, the best approach is to discard it, as the disease is highly contagious and will spread from plant to plant from splashing water. If the plant is valuable, isolate it from your other plants, remove infected tissue with a sterile tool, and drench with a suitable fungicide like Subdue or Banrot following label instructions.