First Report of Powdery Mildew of <i>Hypericum perforatum</i> (St. John’s-wort) Caused by an Anamorphic <i>Microsphaera</i> Species in the Pacific Northwest

Fig. 4. Conidium produced on H. perforatum.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Hypericum perforatum (St. John’s-wort) Caused by an Anamorphic Microsphaera Species in the Pacific Northwest