WSU Extension

Hortsense

Mountain Ash
 
Disease
Fire blight 
Nectria canker 
Insect
Aphids 
Ash borer 
Leaf blister mite 
Mountain ash sawfly 



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


Biology
Nectria canker is a fungal disease often found on twigs and branches that have been weakened by drought, frost damage, insect damage, or other diseases. Cankers are initially distinguished by discolored bark with coral or reddish fungal fruiting bodies. The cankers are sunken and often associated with wounds. Older cankers develop concentric, target-like rings of wood. Affected branches may have stunted or wilted leaves, or fail to produce leaves in the spring. Branches may be girdled.
Management Options


Non-Chemical Management
  • Provide proper plant care. Healthy plants are more resistant to disease.
  • Plant trees or shrubs that are adapted to your climate. Minimizing frost damage and water stress increases disease resistance.
  • Avoid wounding trees. Do not prune in late summer or fall.
  • Prune and destroy infected branches. Make cuts well below diseased tissues.
  • Do not leave stubs when pruning.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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