Plant Parasites of Europe

leafminers, galls and fungi

gallers on Swertia

Dichotomous table for gallers on Swertia perennis

by Hans Roskam

1a Aecia spaciously arranged, on underside of leaf blade on thickened, arched, rotund yellowish or brownish cushions or on oblong-oval, weak bulges on petioles and stems. Puccinia swertiae

1b Rotund-oval or flat spindle-shaped, one-chambered galls, up to 6 mm long; usually on petiole, also on leaf blade, on base of midrib as well as on stem base. Containing a single larva. Smicronyx swertiae

Last modified 21.vi.2020