Butternut Canker and Others

Canker Diseases - Hardwoods

Butternut Canker


Cankers on butternut caused by Ophiognomonia (old name: Sirococcus) clavigignenti-juglandacerarum. The bark has been removed to show the cankered areas.


Black Knot of Cherry


Main stem of cherry with black knot, Apiosporina morbosa.


Branches of cherry with black knot.


Diamond Willow


Cankers on willow stems


Cross section through a canker on willow showing 4 perennial cankers. The white regions are the only areas where the sapwood is still alive.


Golden Canker

Golden Canker

Canker caused by Aurantioporthe (old name: Cryptodiaporthe) corni on the main stem of alternate leaf dogwood. The canker has a bright golden coloration. The dark reddish bark is the natural color ofthe bark and the area not yet affected by the canker causing fungus.