Description: English: The underside of a hops leaf infected by Pseudoperonospora humuli (synonime P. cubensis). The dark coloration is consistent with sporulation. Date: 21 July 2014, 10:27:04. Source: Photos taken by Michelle Marks and emailed to me. Author: Michelle Marks.
Description: Mildiou des Cucurbitaceae (Pseudoperonospora cubensis), symptômes sur feuille de courge (Cucurbita pepo var. pepo). Source: https://www.ipmimages.org/browse/detail.cfm?imgnum=5581639. Author: Edward Sikora, Auburn University, Bugwood.org.