First Report of Powdery Mildew of Onion (<i>Allium cepa</i>) Caused by <i>Leveillula taurica</i> in the Pacific Northwest

Fig. 4. Conidia of Leveillula taurica produced on Allium cepa. (A) Lanceolate conidia. (B) Cylindrical conidium.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Onion (Allium cepa) Caused by Leveillula taurica in the Pacific Northwest