First Report of Powdery Mildew on <i>Corylus avellana</i> caused by <i>Phyllactinia guttata</i> in Washington State

Fig. 1. Chasmothecium of P. guttata produced on C. avellana. Arrow designates gelatinous mass formed by penicillate cells.



Image from Plant Health Progress article:
First Report of Powdery Mildew on Corylus avellana caused by Phyllactinia guttata in Washington State