Canker
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A plant canker is a small area of dead tissue, which grows slowly, often over years. Some cankers are of only minor consequence, but others are ultimately lethal and therefore can have major economic
Butternut canker is a lethal disease of butternut trees, and has no cure.
Canker on a birch
Canker on a beech tree
Canker on an ash tree in North Ayrshire, Scotland
Juglans cinerea
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Juglans cinerea, commonly known as butternut or white walnut, is a species of walnut native to the eastern United States and southeast Canada.
Canker
…Pseudomonas savastanoi, rather than Pseudomonas syringae. After DNA-relatedness studies Pseudomonas savastanoi has been instated as a new species. Butternut canker, caused by the fungus Sirococcus clavigignenti-juglandacearum Bleeding canker of horse chestnut, caused by the bacterium Pseudomonas syringae…
Juglans cinerea 002
A butternut
Fossilized Juglans cinerea (fossil white walnut) in Pleistocene glacial sediments, Michigan
Butternuts killed by butternut canker