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

Fig. 5. Thirty-six hours post-inoculation, necrosis is apparent on wounded control (shown here), but no visibly spreading lesions developed. Unwounded controls showed no symptom development.



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