Eutypella and Strumella Canker
Canker Diseases- - Hardwoods
A very large and old Eutypella canker on maple.
Young 2-4 year old Eutypella cankers on small diameter maple.
Eutypella produces black perithecia with long necks on the surface of cankers (black areas in bark cracks)
Black perithecia viewed under a stereoscope ahowing the long necked perithecia.
Another view of the long-necked, black perithecia produced by Eutypella on the surface of the canker.
Strumella / Urnula Canker on Oak
Strumella (or Urnula) canker on oak.
Young canker on oak stem caused by Strumella (or Urnula).
Ascocarps of Urnula, formed on dead woody material (not on cankers), produce asci and ascospores that cuase cankers on oak trees.