Peronospora trifolii-arvensis von Thümen, 1884

on Trifolium

Peronospora trifolii-arvensis on Trifolium dubium

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

Peronospora trifolii-arvensis on Trifolium dubium

diseased plants

Peronospora trifolii-arvensis: down on Trifolium dubium

down

Peronospora trifolii-arvensis: conidiophore

conidiophore

Peronospora trifolii-arvensis: conidiophore

apical parts of conidiophores

Peronospora trifolii-arvensis: conidia

conidia

Peronospora trifolii-arvensis: oospores

fragment of host tissue with oospores

Peronospora trifolii-arvensis: 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), 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).

mod 5.ix.2019