Supported, at least in part, by rearing records posted on iNaturalist and BugGuide, Trupanea californica is identified as inducing tapered stem swelling galls on Anaphalis and Gnaphalium. See brief discussion at https://www.inaturalist.org/observations/177998606. Ongoing taxonomic revision of the Tephritidae may clarify this.
”- Gallformers Contributors: (2024) Gallformers ID Notes©