Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001532
01/01/98

VINCA DISEASE PROBLEMS

Blight causes brown or black spots which extend inward      
from the leaf edge and eventually cover the whole leaf.     
Space plants farther apart in subsequent plantings.         
Remove infected plants.                                     

Canker and dieback cause the shoot tip to become dark       
brown, wilt, and die back to the soil surface.  The         
disease is most common during rainy weather.  Infected      
plants should be discarded.                                 

Several fungi cause leaf spots on periwinkle.               

Root rots cause decay of roots and stems.  In wet weather   
a cobwebby growth forms on the lower stems.  The lower      
leaves rot and the upper part of the plant dies.            

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