Hym:Tenthredinidae
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Fenusa dohrnii (Tischbein, 1846)
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the early stages of mine formation are seen here

 

Food Plant: Alnus glutinosa (Alder) and other Alnus (Alder) spp.

Mine: Bivoltine - early summer onwards. Trivoltine in a good year.

Notes: A large, brown upper surface blotch, initially between veins and running towards the margin.Very common. The initail stages in mine formation are illustrated.

Pupa: Outside the mine.

Data: 13.x.04, St Helens, Lancs, VC59

Image: © Ben Smart

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