Peronospora obovata Bonorden, 1860

on Spergula

Spergula arvensis, Belgium, prov. Limbourg, Gerhoeven, de Rammelaars, 31.v.2919 © Carina Van Steenwinkel

infected parts turn yellow

detail

conidiophores down

conidiophores

detail

conidia

conidia

gall

leaves pale, may be disfigured. Oospores are formed in the swollen flower buds. Underside with a greyish down, consisting of 0.8 mm high erect conidiophores that apically several times are dichotomously branching, each branch ending upon a conidium.

host plants

Caryophyllaceae, narrowly monophagous

Spergula arvensis.

references

Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a: 96), Buhr (1965a), Chater, Woods, Stringer, ao (2020a), Choi, Klosterman, Kummer ao (2015a), Cunnington (2008a), Dietrich (2013a), Doppelbaur & Doppelbaur (1973a), Doppelbaur, Huber & Poelt (1965a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Müller (2015a), Müller & Kokeš (2008a), Negrean (1995a), Roskam (2019a), Săvulescu (1948a), Tomasi (2014a), Voglmayr (2003a).