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©