Gall (Plate 8.7). A stem swelling-like gall, usually located under the flower head, sometimes in the lower part of the stem; spindle-like or cylindrical stem enlargement, 30-60 mm long, 10 mm in diameter; the surface with longitudinal ribs, like on the stem, sometimes the ribs are waved and distance between them larger, depending on the diameter of the gall. In a longitudinal dissection, single 2 mm large larval cells are visible which are located one near another. The number of larval cells is larger towards the periphery of the gall. The stem above the gall is shortened and the flower stops it development.
Biology. Monovoltine. Relatively rare species. The only known host plant is Scorzonera austriaca Willd. (Asteraceae) (Ambrus, 1974).

[Aulacidea] scorzonerae (Giraud, 1859)
Host plant: Scorzonera austriaca Willd. (Asteraceae).
Distribution: Palearctic, Eastern Europe.