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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.
Plant taxonomy classifies goldenrod in the genus, Solidago. Many species exist; Audubon's Field Guide to New England states that there are more than a dozen in that region. One of the more widespread -- and more striking -- types of this flower is common or Canada goldenrod plant (Solidago canadensis).