Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000303
01/01/98

CATALPA DISEASE PROBLEMS

Anthracnose caused by Gloeosporium catalpae will cause      
dead areas on the leaves.                                   

Leaf spots caused by several fungi can attack catalpa.  A   
symptom of all is brown spots on the leaves.  Leaf spots    
are rarely serious so no chemical control is suggested.     

Powdery mildew causes a white powdery coating on the        
leaves.  When severe, the leaves yellow and fall off.       

Catalpa is susceptible to verticillium wilt.  Branches die  
and eventually the entire tree may die.  A symptom of       
verticillium wilt is discoloration of the sapwood but it    
is hard to find.  Fertilize with a high nitrogen            
fertilizer.                                                 

During hot, dry seasons the leaves may turn brown due to    
scorch.  Little can be done other than watering.            

Catalpa may be chlorotic due to a high soil pH.             

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