First Report of <i>Podosphaera alpina</i> f. <i>alpina</i> on <i>Tolmiea menziesii</i> in Washington State and British Columbia

Fig. 1. Nipple-shaped appressorium (arrow) formed by Podosphaera alpina f. alpina. Scale bar = 15 ┬Ám.



Image from Plant Health Progress article:
First Report of Podosphaera alpina f. alpina on Tolmiea menziesii in Washington State and British Columbia