Another common canker is Cytospora or Leucostoma. The following are pictures of Cytospora canker on Prunus, Poplar, and Spruce.
Alan R. Biggs, West Virginia University
Oscar Dooling, USDA Forest Service, Bugwood.org 
Joseph O'Brien, USDA Forest Service, Bugwood.org
Joseph O'Brien, USDA Forest Service, Bugwood.org
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