Peronospora effusa (Greville) Rabenhorst, 1854

on Spinacia

gall

the infection is mostly systemic; the plants then are seriously disfigured. Upper-side of the leaves with bright yellow, vein-limited spots. At he underside of the leaves a greyish violet to brownish felt-like down of erect, 160-380 µm hig, conidiophores that apically several times are dichotomously branching, each branch ending upon an olivaceous brown conidium, 21-33 µm long. Embedded in the host tissue lie yellowish, thick-walled, smooth, oospores.

hostplants

Chenopodiaceae, narrowly monophagous

Spinacia oleracea.

synonyms

Peronospora farinosa auct.; P. spinaciae Laubert, 1906.

references

Blumer (1946a), Choi, Denchev & Shin (2008a), Choi, Hong & Shin (2007a), Choi, Thines, Han & Shin (2011a), Cunnington (2008a), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Gustavsson (1991a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Losa España (1942a), Müller (2015a), Müller & Kokeš (2008a), Mułenko, Piątek, Wołczańska ao (2010a), Săvulescu (1948a).

mod 1.ix.2018