Plant Parasites of Europe

leafminers, galls and fungi

gallers on Homogyne

Dichotomous table for gallers on Homogyne alpina

by Hans Roskam

1a On vegetative plant parts => 2

1b Capitula deformed; receptacle thickened. Unidentified tephritid fly

= Midge larvae of an undescribed Dasineura occur in capitula of Mediterranean H. alpina

2a Leaf blade or petiole with galls caused by fungi, spores of which develop on the outside, or shine through the gall surface => 5

2b Malformation of the leaf blade by animal inducers => 3

3a Localised galls => 4

3b Leaf blade deflected ± curled, locally intense green. Philaenus spumarius

4a Leaf blade with pock-like swellings, which are especially arched on the underside. Unidentified gall mite

4b Leaf blade between the veins bulging and swollen. Larvae on the underside. Trioza thomasii

5a The fruiting bodies develop on the surface of spindle-shaped galls => 6

5b Wart-shaped, less than 1 mm long galls, the ± golden yellow spores develop inside and shine through the gall surface. Synchytrium vulgatum

6a Only just protruding, orange-coloured thickenings on petioles and on the underside of leaf veins bearing densely, ± circular arrangements of aecia and with pycnidia developing on the upperside. Uromyces veratri

6b Telia in small to extended brown sori. Stronger infestation sites on leaf blades with upperside impressions and with rotund, protruding, compact pads on underside; on veins and petioles developed as ± elongated spindle-shaped, often yellow margined bulges. Puccinia conglomerata

Last modified 21.v.2020