Plant Parasites of Europe

leafminers, galls and fungi

Hyaloperonospora niessliana

Hyaloperonospora niessliana (Berlese) Constantinescu, 2002

on Alliaria

Hyaloperonospora niessliana on Alliaria petiolata

Alliaria petiolata, landgoed Tongeren © Hans Jonkman

Peronospora niessleana

Alliaria petiolata, Dronten; © Arnold Grosscurt

Hyaloperonospora niessleana

Alliaria petiolata, Belgium, prov. Antwerp, Mol © Carina Van Steenwinkel

Hyaloperonospora niessleana

normal, slender conidiophores (coloured with congo red)


young conidiophores are stout, with short and stiff end branches

Hyaloperonospora niessleana

de eindtakken normally a thin and slender

Hyaloperonospora niessleana

the spores are oval, with a short “stalk”


upperside of the leaf locally yellowed; the corresponding underside is covered by a grey bloom of fungus, consisting of terminally branched conidiophores. The same fungus is responsible for the formation of blackish blisters on the stem and petioles; embedded in the host tissue lie here thick-walled oospores.

host plants

Brassicaceae, monophagous

Alliaria petiolata.

Ellis & Ellis describe the species as oligophagous on Brassicaceae; that is not the general opinion.


Peronospora niessliana; the almost universally used orthography “niessleana” is incorrect according to the Index Fungorum.


Brandenburger (1985a), Buhr (1964b), Chater, Woods, Stringer, ao (2020a), Constantinescu & Fatehi (2002a), Doppelbaur, Huber & Poelt (1965a), Ellis & Ellis (1997a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, Voglmayr, Riethmüller ao (2003a), Gustavsson (1991a), Hafellner (1980a), Jage, Klenke, Kruse ao (2016a, 2017a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Müller (2015a), Müller & Kokeš (2008a), Riethmüller, Voglmayr, Göker ao (2002a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Roskam (2009a), Săvulescu (1948a), Voglmayr (2003a).

Last modified 5.x.2021