Plant Parasites of Europe

leafminers, galls and fungi

Peronospora conferta

Peronospora conferta (Unger) Unger, 1847

on Cerastium

Peronospora conferta on Cerastium fontanum subsp. vulgare

Cerastium fontanum subp. vulgare, Belgium, prov. Limburg, Heusden-Zolder © Carina Van Steenwinkel

Peronospora conferta on Cerastium fontanum subsp. vulgare

infected shoot

Peronospora conferta on Cerastium fontanum subsp. vulgare

hypophyllous oown

Peronospora conferta: conidiophore

conidiophore

Peronospora conferta: conidiophore

detail

Peronospora conferta: conidia

conidia 19 x 26 µm

gall

upperside of the leaves with paled, slightly embossed patches; at the corresponding underside a greyish fungal bloom, consisting of erect, distally strongly branched conidiophores. The conidia measure 17-21 x 22-30 µm.

host plants

Caryophyllaceae, narrowly monofaag

Cerastium alpinum, arvense & subsp. glandulosum, fontanum & subsp. vulgare, nigrescens, tomentosum.

synonyms

Peronospora trivialis Gäumann, 1923.

notes

Klenke & Scholler describe the colour of the down as “whitish to pale yellowish”; Brandenburger writes “pale yellowish”; that is not in accordance with the picture above. Because the colour of the down is determined by the colour of the conidia, such a difference is not unimportant. Yet, no other identification was feasible.

references

Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a: 99), Buhr (1964b), Cunnington (2008a), Doppelbaur, Huber & Poelt (1965a), Ellis & Ellis (1997a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, Voglmayr, Riethmüller ao (2003a), Gustavsson (1991a), Hagen (1941a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Kruse (2019a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a), Müller (2015a), Mułenko, Kozłowska, Bacigálová ao (2014a), Mułenko, Sałata & Wołczańska (1995a), Negrean (1996b), Redfern & Shirley (2011a), Riethmüller, Voglmayr, Göker ao (2002a), Ruszkiewicz-Michalska (2006a), Ruszkiewicz-Michalska & Michalski (2005a), Săvulescu (1948a), Voglmayr (2003a).

Last modified 6.viii.2020