Peronospora hornungiae Gustavsson, 1959
upperside of the leaves with paled, slightly embossed patches; at the corresponding underside a greyish fungal down, consisting of erect, distally strongly branched conidiophores. In cases of severe infestation the entire plant may be covered. The conidia measure 13-21 x 14-23 µm.
Brassicaceae, narrowly monofaag
Brandenburger (1985a), Buhr (1964b), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a.