Peronospora arborescens (Berkeley) de Bary, 1863
on Papaver
Papaver dubium, Belgium, prov. Limbourg, Houthalen, Laambeekvallei, 21.v.2019 © Carina Van Steenwinkel: gal
underside of the gall with down
conidiophore
conidiophore, upper section
conidia
host tissue with oogonia
two young oospores within their oogonium
oospore within its oogonium
Papaver rhoeas, Belgium, prov. Namur, Couvin, Aublain © Sébastien Carbonnelle
Peronospora nr. arborescens on Papaver dubium, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel
infected leaf, underside
conidiophore
conidiophore, terminal branches (congo red staining)
conidia
gall
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.
synonyms
See the discussion under Peronospora minor.
notes
considered by Mułenko ao (2010a) a neophyte; first observation in Poland was in 1866.
references
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).