[I]nduce[s] galls in different meristematic tissues of [Tripleurospermum inodorum], including the apical meristems of rosettes and bolting plants, leaf axils, buds, and flowers ...

The 1st generation induced galls in the apical meristem of overwintered rosettes of scentless chamomile, whereas the following 2 generations formed galls in the apical meristems of main and side shoots, in leaf axils, and in or just below buds and flowers ... In contrast to galls induced in the apical meristem of rosettes during the growing period, gall chambers on overwintering rosettes are typically located at the root crown of plants ... The majority of galls that developed in axillary buds or in flowers consisted of 1-2 chambers, whereas galls formed in the apical meristems of rosettes and bolting plants usually contained >2 chambers ...

[in measuring the galls, which varied in size,] it was assumed that the shape of the galls is elliptical.

- Hinz, Harriet L. : (1998) Life History and Host Specificity of Rhopalomyia n. sp. (Diptera: Cecidomyiidae), a Potential Biological Control Agent of Scentless Chamomile^©