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The goldenrod gall fly lives its entire life on goldenrod plants. This fly is small and grows to be about five millimetres long with females usually being a bit larger.Females have an âegg-laying tubeâ (ovipositor) that extends from their abdomen making them easier to identify.oldenrod gall flies do not seem to have any effects on us. They do not sting or bite and they tend to be focused only on mating and goldenrods; in fact, their activities do not even harm the goldenrod.
The commonest goldenrod gall is a round gall in the middle of a stem called a ball gall, made by the Goldenrod Gall Fly, Eurosta solidaginis. In spring, the female fly lays her eggs on goldenrod stems. When the larvae hatch, they chew their way into the stems and galls start to develop. very different type of gall is made by a tiny fly called the Goldenrod Gall Midge, Rhopalomyia solidaginis. The gall is a tight cluster of small leaves at the top of a stalk that resembles a green flower and is called a bunch gall, rosette gall or flower gall.