The diseased areas are dark colored and decayed.
Many spore pustules develop in the decaying leaves and stems.
Black rot causes infected leaves to turn purplish brown or black. If the pseudobulb is infected before the leaf, the part above the infection dies. Leaf blight symptoms are purplish brown or black leaves. A number of leaf spots attack this species of orchid. Basal rot invades the root collar then extends into the leaves.