Peronospora calotheca de Bary, 1858

on Asperula, Galium

Galium odoratum, Hongarije, Mosonmagyaróvár, 20.iv.2019 © László Érsek

light infection

advanced infection

underside of an infected leaf

gall

the plants look etiolated, elongated; upper side of the leaves yellowed with a green, later black tip; at the underside a greyish fungal bloom, consisting of vertical, distally repeatedly dichotomously branched conidiophores.

host plants

Rubiaceae, oligophagous

Asperula arvensis, cynanchica, tinctoria; Galium odoratum.

references

Brandenburger (1985a), Buhr (1964b), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Göker, Voglmayr, Riethmüller ao (2003a), Gustavsson (1991a), Hafellner (1980a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Müller (2015a), Müller & Kokeš (2008a), Negrean (1996b), Negrean, Constantinescu & Denchev (2004a), Riethmüller, Voglmayr, Göker ao (2002a), Ruszkiewicz-Michalska (2006a), Săvulescu (1948a), Voglmayr (2003a).