Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000968
01/01/98

MORUS DISEASE PROBLEMS

Bacterial blight causes spots on the leaves and shoots.     
The spots later become sunken and turn black.  Infected     
leaves are distorted and the shoots have black stripes.     
The leaves at the twig tips wilt and die.  Prune out dead   
shoots in the fall.                                         

In years favorable for leaf spots, the trees may be         
defoliated.  Rake up and dispose of infected leaves.        

Cankers cause dieback of branches and kill trees if the     
trunk is infected.  Prune out infected branches and keep    
the trees healthy.                                          

Powdery mildew causes a white coating on the leaves.        

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