FoxgloveDownyMildewPlantSymptoms2Glass_by_Jenny-Glass-2011_pnwhandbooks.org April 14, 2016 500 × 433 Peronospora digitalidis Gäum, 1923 Downy mildew does occur in the landscape in Washington. Note lesions with angular margins. ~ Photo Credit: Jenny Glass, 2011. Photo Description and Source: Downy mildew does occur in the landscape in Washington. Note lesions with angular margins. ~ Jenny Glass, 2011. http://pnwhandbooks.org/plantdisease/foxglove-digitalis-spp-downy-mildew