WSU Extension


Bacterial leaf spot and dieback 
Leaf scorch 
Nectria canker 
Phyllosticta leaf spot 
Powdery mildew 
Tar spots 
Verticillium wilt 
Cottony maple scale 
Maple bladdergall mite 

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Caption: Fasciation
Photo by: R.S. Byther
Maple : Fasciation
(revision date: 4/28/2014)

Fasciation is a plant deformity which results in abnormally flattened stems. It is the result of a mutation in the growing point of the stem and is not a disease. Instead of being round, affected stems are flat or ribbed in appearance, and may be bent or curved in odd patterns. The leaves produced on the flattened stems usually appear normal, but may be somewhat undersized. Usually only a portion of a plant displays fasciation. Although not contagious, fasciation may sometimes be spread by seeds or through propagation of affected plant parts.
Management Options

Non-Chemical Management
  • Prune out misshapen portions of affected plants.
  • Remove affected plants, if desired.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


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Caption: Fasciation
Photo by: R.S. Byther