Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001249
01/01/98

RHUS DISEASE PROBLEMS

Several fungi cause cankers leading to dieback.  Fertilize  
to keep plants healthy and prune out infected parts.        

Fusarium wilt infects roots, causing the leaves to droop    
and wilt.  A light infection causes only gradual            
dwarfing or yellowing and premature red leaf coloration.    

Leaf spot caused by Pezizella oenotherae causes gray        
spots with purplish margins that merge, giving the leaves   
a scorched appearance.                                      

Various genera of powdery mildew forms a white coating on   
the leaves.                                                 

Verticillium wilt causes wilting of individual stems,       
followed by death of the foliage.  Eventually the entire    
plant dies.  Prune out infected branches.  Do not replant   
in the same spot with sumac or other susceptible plants.    

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