Cecidomyia? eupatoriflorae sp. nov.

Gall. Green, succulent and pubescent. Globular or irregularly rounded, with or without a depression at the apex around which are deformed petals of the flowers. It is usually on a short stalk, like the flowers of the plant. Inside it is soft, watery, and is inhabited by several larvae, which live in separate chambers. Length from about 10 to 16 mm; width about 8 to 15 mm. The gall grows singly or in clusters among the flower-heads of Eupatorium ageratoides [Ageratina altissima], in September.

Habitat: NC, NY

...from overwintering larva...Gall on Ageratina altissima (Linnaeus).

Terminal, globular, succulent flower bud gall...Schizomyia eupatoriflorae (Beutenmüller)

Galls can be found in late summer. The red, active larvae overwinter in the soil...Host: A. altissima...