Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000172
01/01/98

ASTER DISEASE PROBLEMS

Leaf spot fungi cause spots of various types on the         
leaves.  The spotting may be worse in rainy seasons.        

Downy mildew causes a downy mold on the lower leaf          
surfaces but is not important on aster.                     

Powdery mildew develops on the lower parts of crowded       
plants in late season.  Symptoms are a whitish coating on   
the leaves.                                                 

Bacterial crown gall causes the formation of rough,         
rounded galls.  The galls form near the soil surface.       
Avoid infested soil and destroy infected plants.  No        
chemical control is available.                              

Verticillium wilt occasionally kills plants.  No chemical   
control is available.                                       

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