Many Midwestern yards are adorned by black walnut trees. The black walnut (Juglans nigra) is a large, handsome native tree that bears edible nuts. There’s just one problem with black walnuts: They’re ...
A canker on an eastern black walnut tree. The beetle that carries the fungus causing thousand cankers disease is visible in the canker's upper left corner. (Colorado State University photo/Ned ...
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