The larva of the fly Aulagromyza tridentata feed on willows such as Crack-willow and Osier producing an elongated yellowish blotch mine, which may be either upper surface, lower surface or starting lower surface and ending upper surface.
Where willow, the larval foodplant is present.
The larval mines are tenanted in summer and early autumn.
Larvae feed on Crack willow, Osier and other willows.
Found mainly in southern England, from the Midlands southwards, and infrequently recorded.
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