Euphorbia esula, Belgium, prov. Liège, Huy, Statte © Jean-Yves Baugnée

gall

Infected plants are seriously disfigured; sometimes they are dwarfed, but more often they are scrawny, growing steeply upright; they do no flower; the leaves are pale or greyish, malformed, sometimes thickened. Spermogonia honey-coloured, hypophyllous. Aecia likewise hypophyllous, often in dense groups, cupulate with a white, outwards curved margin that is split into segments; the spore mass inside is orange.

A considerable number of rusts of th genus Uromyces that all have their uredinia and telia on Fabaceae species have aecia as just described. They cannot be identified on the base of external characters. Therefore they are collective addressed as Aecidium euphorbiae.

host plants

Euphorbiaceae, monophagous

Euphorbia cyparissias, dulcis, esula & subsp. tommasiniana, salicifolia, seguieriana, palustris, verrucosa.

notes

check here about the the genus Aecidium.

references

Buhr (1964b), Gäumann (1959a), Gjaerum (1986a), González-Fragoso (1925a), Heluta, Hayova, Tykhonenko ao (2010a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2019a), Riegler-Hager (2000a), Ruszkiewicz-Michalska (2006a), Săvulescu & Rayss (1935a).