Single, expansive bark canker caused by Paradox canker on walnut, Chandler variety, that contains lobe-like, lightly discolored necrosis in the new expansion. The dark necrosis extends completely through bark and stains wood.

Single, expansive bark canker on Chandler variety that contains lobe-like, lightly discolored necrosis in the new expansion. The dark necrosis extends completely through  bark and stains wood. Credit: Janine K. Hasey
Credit: Janine K. Hasey