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

Fig. 1. S. dipsacearum conidiophore with chain of conidia.



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