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

Fig. 4. Golovinomyces orontii conidia formed on Vinca major. Scale bar = 25 mm.



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