First Report of Powdery Mildew on <i>Dipsacus sylvestris</i> Caused by <i>Sphaerotheca</i> <i>dipsacearum</i> in North America

Fig. 2. S. dipsacearum conidial chain (differential interference contrast microscopy).



Image from Plant Health Progress article:
First Report of Powdery Mildew on Dipsacus sylvestris Caused by Sphaerotheca dipsacearum in North America