The canker is also a result of stress to the tree, too deep planting or other irregularities. The brownish coloration at the sunken areas in Nick's photo is also an indicator. Good to consider species susceptibility.
Bleeding Canker or Necrosis, is my guess. The species is prone to it. Sometimes described as motor oil like looking spots with a redder brown color more inside the bark. Sometimes the areas are sunken. Is there an unpleasant sweet smell? Fungal disease, with no chemical treatment. A bad...
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