Peronospora rumicis Corda, 1837

on Rumex

Rumex acetosa, Belgium, prov. Antwerp, Herselt, Langdonken, 18.v.2022 © Carina Van Steenwinkel: infected female inflorescence (the green leaves that still were present did not show indications of being infected)

detail of the infected female inflorescence

infected and healthy flower in the male inflorescence

detail

conidiophore bundles

ultimate branchings

bases of the conidiophores

conidia (measurements in the present material 17-22 x 27-32 µm)

gall

development of the plant disturbed by a systemic infection; the discoloured leaves stand stiffly erect. Underside of the leaves with a greyish purple down of 0.6 mm high erect conidiophores that apically several times are dichotomously branching, each branch ending in an elliptic conidium.

host plants

Polygonaceae, monophagous

Rumex acetosa, acetosella, arifolius, crispus, nivalis, scutatus, thyrsiflorus.

references

Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a: 89), Buhr (1965a), Chater, Woods, Stringer, ao (2020a), Choi, Constantinescu & Shin (2007a), Choi, Denchev & Shin (2008a), Constantinescu & Fatehi (2002a), Dauphin & Aniotsbehere (1997a), Doppelbaur & Doppelbaur (1973a, 1974a), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Göker, Voglmayr, Riethmüller ao (2003a), Gustavsson (1991a), Jage, Klenke, Kruse ao (2016a, 20017a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Müller (2015a), Müller & Kokeš (2008a), Mułenko, Kozłowska, Bacigálová ao (2014a), Redfern & Shirley (2011a), Riethmüller, Voglmayr, Göker ao (2002a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Săvulescu (1948a), Thines, Telle, Ploch & Runge (2009b), Voglmayr (2003a).