First Report of Powdery Mildew of Periwinkle Caused by <i>Golovinomyces orontii</i> in North America

Fig. 3. Golovinomyces orontii conidiophore formed on Vinca major, with chain of developing conidia and curved foot cell (arrow). Scale bar = 25 mm.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Periwinkle Caused by Golovinomyces orontii in North America