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Figure 1.  This black walnut was killed by the thousand-cankers disease fungus.  Photo courtesy of Curtis Utley, CSUE, Bugwood.org.

Thousand-cankers disease (Geosmithia morbida Kolařík, Freeland, Utley, and Tisserat (Ascomycota: Hypocreales)) is a fungal pathogen affecting most of the North American species of walnuts (Juglans L.).  Some walnuts are moderately susceptible, but others such as black walnut (Juglans nigra L.) are highly susceptible (Fig. 1).  [...]

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