Peronospora arvensis Gäumann, 1918
on Veronica
Veronica gr. hederifolia, Germany, Niedersachsen, Göttingen, 21.iii.2023 © Gerrit Öhm
infected leaves
detail
Veronica hederifolia, Belgium, prov. Limburg, Lummen, Meldert © Carina Van Steenwinkel
infected leaves
underside of an infected leaf
conidiophore
conidia
gall
leaves pale, may be disfigured. Underside with a greyish-violet down, consisting of 0.4 mm high erect conidiophores that apically several times are dichotomously branching, each terminal branch ending in a conidium.
host plants
Plantaginaceae, narrowly monophagous
Veronica dillenii, hederifolia, sublobata, triloba, triphyllos.
A reference to V. arvensis by Negrean probably concerns P. agrestis.
references
Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a: 576), Buhr (1965a), Chater, Woods, Stringer, ao (2020a), Doppelbaur, Huber & Poelt (1965a), Göker, García-Blázquez, Voglmayr ao (2009a), Göker, Voglmayr, Riethmüller ao (2003a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Müller (2015a), Müller & Kokeš (2008a), Negrean (1996b), Riethmüller, Voglmayr, Göker ao (2002a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Săvulescu (1948a), Scheuer & Bechter (2012a), Voglmayr (2003a).