WSU Extension

Hortsense

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



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Caption: Tubercularia canker fruiting bodies
Photo by: R.S. Byther
  
Maple : Nectria canker
(revision date: 4/28/2014)


Biology
Nectria is a fungal infection which often attacks via wounds and forms cankers on twigs, branches, and trunks. The cankers are often sunken areas that develop conspicuous yellow to orange-red fungal fruiting bodies in the dead bark. Nectria cankers may girdle twigs and kill them or become elongated and enlarge year after year. Older cankers may develop a characteristic target or bull's-eye shape. Infected branches are susceptible to breakage in wind storms and should be removed.
Management Options


Non-Chemical Management
  • Provide proper culture to maintain healthy, vigorous, disease-resistant trees.
  • Avoid wounding trees.
  • Prune and destroy infected twigs and branches.
  • Prune properly to reduce risk of infection through pruning wounds or stubs.
  • To minimize infection risks, do not plant in cold pockets or on poorly drained sites.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Tubercularia canker fruiting bodies
Photo by: R.S. Byther