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. Infected leaves wilt, discolor, and break off, usually at the base. The base of the stem may be covered with a thick fungal growth.
Petal blight causes spots on the petals.
The spots may be bordered by pink rings. If the spots enlarge, the petal may fall off. Abnormal flower colors may be due to a virus disease called cattleya flower break. The virus is carried by the green peach aphid. This information is for educational purposes only.