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

Fig. 3. Conidiophores of Leveillula taurica emerging from a stoma of Allium cepa.



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