Rhagoletis alternata is a species of fruit fly with well marked banding on the wings. This genus contains a number of similar species and care must be taken over identification.
Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.
Around rose hips.
Larvae feed inside rose hips.
Not well recorded, but seems to be widespread and fairly frequent in Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015