First Report of Powdery Mildew of Poison-Hemlock Caused by <i>Erysiphe heraclei</i> in North America

Fig. 1. Signs of powdery mildew disease on Conium maculatum leaf caused by Erysiphe heraclei.



Image from Plant Health Progress article:
First Report of Powdery Mildew of Poison-Hemlock Caused by Erysiphe heraclei in North America