Plant Parasites of Europe

leafminers, galls and fungi

Peronospora arborescens

Peronospora arborescens (Berkeley) de Bary, 1863

on Papaver

Peronospora arborescens: gall on Papaver dubium

Papaver dubium, Belgium, prov. Limbourg, Houthalen, Laambeekvallei, 21.v.2019 © Carina Van Steenwinkel: gal

Peronospora arborescens: down

underside of the gall with down

Peronospora arborescens: conidiophore


Peronospora arborescens, conidiophore ultimate branching

conidiophore, upper section

Peronospora arborescens: conidia


Peronospora arborescens: host tissue with oogonia

host tissue with oogonia

Peronospora arborescens: oogonia with oospores

two young oospores within their oogonium

Peronospora arborescens: oogonium with oospore

oospore within its oogonium

Peronospora arborescens: galls on Papaver rhoeas

Papaver rhoeas, Belgium, prov. Namur, Couvin, Aublain © Sébastien Carbonnelle

Peronospora nr. arborescens on Papaver dubium

Peronospora nr. arborescens on Papaver dubium, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel

Peronospora nr. arborescens on Papaver dubium

infected leaf, underside

Peronospora nr. arborescens conidiophore


Peronospora nr. arborescens conidiophore

conidiophore, terminal branches (congo red staining)

Peronospora nr. arborescens conidia



upper side of the leaves with small, venation-delimited, initially yellow, ultimately red to brown, spots. Their underside with a felty down, consisting of erect, 360-600 µm high conidiophores that apically several times are dichotomously branching, each branch ending in a conidium

host plants

Papaveraceae, nauw monophagous

Papaver rhoeas.

also Papaver dubium?

In the molecular-genetic analysis by Voglmayr ao landed the samples from Papaver dubium on a separate position, between Peronospora arborescens and P. somniferi. Because they had a relatively limited material at their disposition it was decided to leave this material without a name.
Jage, Klenke, Kruse ao provisionally place also material from P. croceum, lasiothrix, lateritium, orientale, and pilosum under arborescens.


See the discussion under Peronospora minor.


considered by Mułenko ao (2010a) a neophyte; first observation in Poland was in 1866.


Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a), Buhr (19645a), Chater, Woods, Stringer, ao (2020a), Choi, Constantinescu & Shin (2007a), Cunnington (2008a), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Gustavsson (1991a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Losa España (1944a), Mułenko, Piątek, Wołczańska ao (2010a), Kruse (2014a, 2019a), Kruse & Jage (2014a), Müller (2015a), Müller & Kokeš (2008a), Negrean, Constantinescu & Denchev (2004a), Özaslan, Hüseyin & Erdogdu (2014a), Redfern & Shirley (2011a), Săvulescu (1948a), Thines & Choi (2016a), Thines, Telle, Ploch & Runge (2009b), Tomasi (2014a), Voglmayr (2003a), Voglmayr, Montes-Borrego & Landa (2014a).

Last modified 13.x.2021