Peronospora knautiae Fuckel, 1886
on Knautia, Scabiosa
gall
leaves with amphigenous brownish-violet spots. Their underside with a greyish-white to violet down, consisting of erect conidiophores that apically several times are dichotomously branching, each branch ending upon an elliptic conidium.
host plants
Caprifoliaceae, oligophagous
Knautia arvensis, dipsacifolia, drymeia, godetii, kitaibelii, transalpina; Scabiosa columbaria, lucida, ochroleuca.
references
Blumer (1946a), Brandenburger (1985a), Constantinescu & Denchev (2004a), Cunnington (2008a), Doppelbaur & Doppelbaur (1973a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Jage, Klenke, Kruse ao (2016a, 2017a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Müller (2015a), Müller & Kokeš (2008a), Mułenko, Kozłowska, Bacigálová ao (2014a), Mułenko, Sałata & Wołczańska (1995a), Negrean (1995a), Negrean, Constantinescu & Denchev (2004a), Ruszkiewicz-Michalska (2006a), Săvulescu (1948a), Voglmayr (2003a).