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Fenusa ulmi Sundevall, 1847
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forms a blotch mine

Food Plant: Ulmus glabra (Elm)

Mine: Early Summer onwards

Notes: A full depth blotch mine, which usually starts from the angle formed by the midrib and a vein. The taxonomy of the sawflies feeding on Ulmus is problematic and unresolved at present. Kaliofenusa pusilla is an unplaced species and F.ulmi was recorded in Ireland (2004, Knight) as K. pusilla.
In Europe there are at most two species on Elm, with Fenusa ulmi on Ulmus glabra and Fenusa altenhoferi on U.minor and U.procera. It is not clear whether U.laevis is a host of Fenusa. Fenusa ulmi mines seem to start in the leaf interior and Fenusa altenhoferi from the leaf edge, but perhaps this is not constant and further research needs to be undertaken.

Data: 12.vi.2006 form mines 05.vi.2006, Zwett, Austria, E.Altenhofer

Image:© Rob Edmunds

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