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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.
There are two groups of flies that do have larval stages that live on or in human skin. One, the human bot fly (Dermatobia hominis, family Oestridae), has large, 1-2 cm (Â½-1 inch) long, larvae that live and feed in the skin. These flies are not found in North America, only in Central and South America.However, there are rare cases of rodent bots infesting humans in California.The other flies, with larvae that feed on humans, are screw worms and blowflies (family Calliphoridae). The larvae of these flies feed on dead or decaying tissue, and less commonly living tissue.owever, there are rare cases of rodent bots infesting humans in California. The other flies, with larvae that feed on humans, are screw worms and blowflies (family Calliphoridae). The larvae of these flies feed on dead or decaying tissue, and less commonly living tissue.