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

Fig. 3. Semipapillate, noncaducous zoosporangium typical of P. citricola.



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