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

Fig. 4. Thirty-six hours post-inoculation, P. citricola-inoculated tissue shows lesion development, necrosis, and spread on both wounded (A) and unwounded (B, shown here) tissue. Gummosis was a common symptom (C).



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