Most common pests are mealy bug and scale .
Both can be controlled by broad-spectrum insecticides recommended for use on orchids. Mites can be a problem during hot weather. Since these tiny pests are hard to see, look for irregular rust-colored pitted areas predominantly on the underside of leaves. Use insecticides that are specifically recommended for controlling mites, since most broad-spectrum insecticides are ineffective. Poor air circulation and wet conditions on cool nights encourage fungal and bacterial diseases .