Hyaloperonospora rorippae-islandicae (Gäumann) Göker, Voglmayr & Oberwinkler, 2009

on Rorippa

Hyaloperonospora rorippae-islandicae on Rorippa palustris

Rorippa palustris, Belgium, prov. Flemish Brabant, Deurne (bij Diest), Vallei van de drie beken, Schutshaag, 2.vii.2019 © Carina Van Steenwinkel

Hyaloperonospora rorippae-islandicae on Rorippa palustris

same leaf, underside

Hyaloperonospora rorippae-islandicae on Rorippa palustris

infection also on the stem

Hyaloperonospora rorippae-islandicae : conidiophore

crown of the conidiophore

Hyaloperonospora rorippae-islandicae : conidium

conidium

gall

upperside of the leaf with pale spots, margin often downfolded; plant sometimes totally disfigured. Underside of the leaves with a greyish down of 0.7 mm high erect conidiophores that apically several times are dichotomously branching, each tip bearing an ovoid conidium.

host plants

Brassicaceae, monophagous

Rorippa amphibia, austriaca, islandica, palustris, sylvestris.

synonyms

Peronospora rorippae-islandicae Gäumann, 1918.

references

Brandenburger (1985a), Buhr (1965a), Doppelbaur & Doppelbaur (1974a), Gustavsson (1991a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Săvulescu (1948a), Tomasi (2014a).

mod 6.vii.2019