<i>Phytophthora citricola</i> Causes a Stem Canker in Black Walnut (<i>Juglans nigra</i>)

Fig. 1. An accompanying photo of black walnut submitted to the Plant and Pest Diagnostic Laboratory in spring 2005, showing dieback, death, and gummosis associated with black walnut canker.



Image from Plant Health Progress article:
Phytophthora citricola Causes a Stem Canker in Black Walnut (Juglans nigra)