Catalpa Diseases

Disease	Symptoms	Pathogen/Cause	Management
Leaf Spot	Brown to black spots form on leaves. These spots may drop out or leaves may fall premeturely.	Many different fungi can cause spotting.	No control is recommended since little damage occurs.
Powdery Mildew	White fungal growth develops on the upper surface of the lower leaves.	Microsphaera or Phyllactinia	No control is recommended since little damage occurs.
Verticillium Wilt	Purplish to bluish brown streaks are found under the bark in the sapwood of wilted branches. Often, wilting develops on branches on one side of the tree.	Verticillium	Trees may die within a year or may survive to wilt to some extent every year. There are no effective controls. Do not replace a Verticillium wilt-killed tree with another catalpa or other species susceptible to the disease.