Fenusa dohrnii

Alternative names
European Alder Leafminer

The larvae of the sawfly Fenusa dohrnii mine the leaves of various species of Alder (Alnus sp.). The mine takes the form of a large brownish blotch, without an initial corridor. Usually the mine starts near a vein axil, and expands towards the leaf margin. The mine mostly remains enclosed by two thick lateral veins. The adult sawfly is largely black in colour but it is the larval mines that are more regularly recorded.

Identification difficulty

Adult Leafmine

ID guidance

Wherever Alder occurs.

When to see it

When Alder is in leaf.

UK Status

Widespread in Britain but infrequently recorded.

VC55 Status

Rare or under recorded in Leicestershire and Rutland.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map