These are located on the stems at the apical growing point, usually with one or more swollen pairs of leaves associated with them. Galled shoots are often prevented from flowering, but flowering is occasionally seen above the galled growing point. Post-emergence galls and associated leaves rot and turn black. After the apical growing region rots, the plant sends out a new shoot from a lower meristem.

- Rossi, Anthony M, and Donald R Strong: (1990) A New Species of Asphondylia (Diptera: Cecidoyiidae) on Borrichia (Asteracae) from Florida^©

Reference: https://www.biodiversitylibrary.org/page/26238329#page/751/mode/1up