Butternut Canker and Others
Canker Diseases - Hardwoods
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.
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.
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.