[G]alls developed at nodes on the main stem and also on side shoots of A. vulgaris. Fully formed galls ranged ... from about 3 to 19 mm in diameter. Mugwort plants were often found to have multiple galls ... The smaller galls [which typically were higher on the stem and] developed later in the season ... were sometimes associated with inflorescences ...

- Mapes, C. C., Lawrence, J. T., Setliff, G. P., Looney, C., Elsayed, A. K., Datko, A. C., Friehauf, K., Bohn, E., Falkowski, J., Wink, Z. W., & Tsuru, T. K.: (2025) First record of a gall-inducing mordellid in North America: Pseudomordellina hattorii (Coleoptera: Mordellidae) induces galls on common mugwort, Artemisia vulgaris in the Northeastern United States^©