GALL
Weak swellings, up to 8 mm thick, of the stem, preferably high in the plant. The gall contains some gall chambers with a diameter of 3 mm, that are more or less coalescing. Univoltine, hibernation and pupation in the gall.

HOST PLANTS
Asteraceae, narrowly monophagous: Sonchus asper

- Willem N. Ellis: (2021) Plant Parasites of Europe^©

Reference: https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/hymenoptera/apocrita/cynipoidea/cynipidae/cynipinae/aulacideini/aulacidea/aulacidea-follioti/