Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001530
01/01/98

VIBURNUM DISEASE PROBLEMS

Bacterial leaf spot causes round, water-soaked spots on     
leaves and young stems.  These develop into shrunken,       
brown areas about 1/8 inch in diameter.                     

Bacterial crown gall forms galls on the lower stems.        
There is no chemical control.  Remove infected plants and   
do not replant in the same spot.                            

Shoot blight causes grayish to brown decayed spots on       
the leaves.  The spots first appear at the leaf margins,    
then spread to the rest of the leaf.  Infected flower       
clusters or twigs are killed.  The disease is caused by     
Botrytis cinerea.                                           

A number of fungi cause leaf spots.  Rake up and destroy    
infected leaves.                                            

Powdery mildew causes a white powdery growth on the         
leaves.                                                     

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