The gall midge Dasineura kiefferiana causes galls to form on the leaves of Rosebay Willowherb. The leaf margins roll inward or fold downward, narrow, tight and thickened, often flattened 7 to 10 mm long but may coalesce to form a longer roll.
Where the host plant (Rosebay Willowherb) occurs.
When Rosebay Willowherb is in leaf.
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