Peronospora trifolii-arvensis von Thümen, 1884

on Trifolium

Trifolium dubium, Belgium, prov. Limbourg, Kinrooi, Stamprooierbroek, 25.v.2019 © Carina Van Steenwinkel

diseased plants

down

conidiophore

apical parts of conidiophores

conidia

fragment of host tissue with oospores

oospores

gall

tips of the shoots unhealthy, with shortened internodes. Underside of the leaves with a greyish white to purplish-brown fungal cover of 0.7 mm high erect conidiophores that apically several times are branching, each branch ending upon a conidium.

host plants

Fabaceae, monophagous

Trifolium arvense, aureum, badium, campestre, dubium, patens, spadiceum.

synonyms

Peronospora trifolii-minoris Gäumann, 1923 (synonymy according to Klenke & Scholler).

Contrariwise, according to García-Blázquez ao trifolii-minoris in fact is a valid species, that parasitises all species listed above except T., arvense.

the Index Fungorum (2016) considers P. trifolii-arvensis a mere junior synonym of P. trifoliorum.

references

Blumer (1946a), Brandenburger (1985a: 317), Chater, Woods, Stringer, ao (2020a), Dietrich (2013a), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Göker, Voglmayr ao (2008a), Göker, García-Blázquez, Voglmayr ao (2009a), Gustavsson (1991a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Müller & Kokeš (2008a), Ruszkiewicz-Michalska (2006a), Săvulescu (1948a).