|Leaf spot||Brown to black spots form on leaves. These spots may drop out or leaves may fall prematurely.||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. Wilting often 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 tree killed by Verticillium wilt with another catalpa or other species susceptible to the disease.|
Discoloration by Verticillium
Prepared by Gary W. Moorman, Professor of Plant Pathology
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