The larvae of the fly Calycomyza artemisiae mine the leaves of Mugwort. The mines are seen more often than the adult. The mine is a characteristically pale whitish, usually upper-surface primary blotch. There is an initial corridor, but traces of it are almost always overrun by the later blotch. The mine is quite opaque.
Areas where Mugwort is present.
Mines can be seen when Mugwort is in leaf.
Pupation occurs outside of the mine.
True status in Britain is difficult to determine due to lack of records although it appears to be widespread.
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