Managing Powdery Mildew on Verbenas
Powdery mildew is caused by the fungus Erysiphe cichoracearum. This pathogen infects many different hosts, including annual and perennial flowers, and vegetables. However, this is not the same powdery mildew fungus that infects roses or poinsettias. The fungus grows only on living tissue and becomes established on healthy plants.
Source: • American Floral Endowment Special Research Reports #119
Keywords: Powdery mildew Verbena