First Report of Powdery Mildew of <i>Stachys byzantina</i> (Lamb’s Ear) Caused by <i>Neoerysiphe galeopsidis</i> in North America

Fig. 2. Appressorium of Neoerysiphe galeopsidis formed on Stachys byzantina. Scale bar = 15 µm.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Stachys byzantina (Lamb’s Ear) Caused by Neoerysiphe galeopsidis in North America