First Report of Powdery Mildew of <i>Mahonia aquifolium</i> Caused by <i>Microsphaera berberidis</i> (<i>Erysiphe berberidis</i>) in North America

Fig. 1. Foliar symptoms of powdery mildew of Mahonia aquifolium.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Mahonia aquifolium Caused by Microsphaera berberidis (Erysiphe berberidis) in North America