First Report of Powdery Mildew of <i>Platanus occidentalis</i> caused by <i>Microsphaera platani</i> (<i>Erysiphe platani</i>) in Washington State

Fig. 3. Microsphaera platani ascocarp with dichotomously-branched appendages.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Platanus occidentalis caused by Microsphaera platani (Erysiphe platani) in Washington State