Hym:Tenthredinidae
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Fenusa dohrnii (Tischbein, 1846)
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the large brown mine is formed initially between the veins

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.

Pupa: Outside the mine.

Data: 14.x.2003, Fleet, Hants, VC12

Image: © Rob Edmunds

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