First Report of Powdery Mildew of <i>Convolvulus arvensis </i>(Field Bindweed) Caused by <i>Erysiphe convolvuli</i> var. <i>convolvuli</i> in North America

Fig. 3. Asci containing variable numbers of ascospores formed by E. convolvuli var. convolvuli. A portion of the ascocarp wall (brownish material) is visible on left side of photograph.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Convolvulus arvensis (Field Bindweed) Caused by Erysiphe convolvuli var. convolvuli in North America