Eutypella and Strumella Canker

Canker Diseases- - Hardwoods

Eutypella and Strumella Canker

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Young Eutypella canker on small diameter maple stems.

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Old Eutypella canker on main stem of maple.

Eutypella canker

Black perithecia with long necks are produced on the canker.

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Long-necked, black perithecia produced by Eutypella on the surface of the canker.

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Strumella (or Urnula) canker on oak.

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Young canker on oak stem caused by Strumella (or Urnula).

Urnula

Ascocarps of Urnula, formed on dead woody material (not on cankers), produce asci and ascospores .