The larvae normally feed in galls on the roots of goldenrod (Solidago), growing in damp or wet soils. Occasionally the root galls project above the surface of the ground. Sometimes galls are formed on the stems, especially when the roots of the host are covered with water, during oviposition. A patch of infested goldenrod will frequently yield many galls, often several on the roots of a single plant, but with only a single larva or puparium in each gall. The infestations are usually in the form of local colonies. There are many species of closely related goldenrods in Florida, and possibly more than a single species serves as host. One species was identified, through the courtesy of authorities at the United States National Museum, as Solidago fistulosa. Daecke recorded the host on Long Island, N.Y., as S. juncea. p.28

[NOTE: S. juncea is for E. comma]

- Foster H. Benjamin: (1934) Descriptions of some Native Trypetid Flies with Notes on their Habits^©