Charles Davis, who is working to revise the taxonomy of Diastrophus, stated at https://www.inaturalist.org/observations/80365978 that he had "some galls from [Horkelia] and have dissected and reared cynipids from these" and expressed interest in obtaining a sample of the H. daucifolia gall.
”- Gallformers Contributors: (2024) Gallformers ID Notes©