First Report of Powdery Mildew of Fringed Willowherb (<i>Epilobium ciliatum</i>) Caused by <i>Podosphaera epilobii</i> in North America

Fig. 1. Appressorium (arrow) formed by Podosphaera epilobii.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Fringed Willowherb (Epilobium ciliatum) Caused by Podosphaera epilobii in North America