Plant Parasites of Europe

leafminers, galls and fungi

gallers on Saussurea

Dichotomous table for gallers on Saussurea alpina

by Hans Roskam

1a Galls localised or extending over leaves => 2

1b Development of flower head stunted, heads remaining closed, appearing ± globular turgid; soon filled with brown spore masses. Thecaphora trailii

1c Gall midge larvae in flower heads. Dasineura saussureae

2a Leaf blade with ± rotund pads bearing aecia, protruding on the underside, not or slightly swollen. Puccinia rupestris

2b Galls caused by animal parasite => 3

3a Malformations extensive, of various types => 4

3b Leaf blade with many small, pustule-like swellings. Aceria saussureae

4a Leaf blades or petioles with ± expanded, spongy, pale green, often rugose swellings. Ditylenchus dipsaci

4b Large parts of leaves curved downwards or rolled. Infected leaf blade parts ± crookedly curled and coloured dark green close to the froth-covered nymph. Philaenus spumarius

Last modified 16.vi.2020