Hym:Tenthredinidae
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Heterarthrus wuestneii (Konow, 1905)
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the disc has formed

 

Food Plant: Acer campestre (Field maple) only.

Mine: Bivoltine: summer & autumn

Pupa: Outside the mine, inside an excised cut out disc.

Notes: A blotch like H.aceris, but smaller and usually including the tip of a lobe. There is always an excised hole (forming the cut out disc above) and the mines go brown. Uncommon.

Synonymy: Heterarthrus healyi

Data: 08.vi.2006, Baden, Lower Austria, Ewald Altenhofer

Image:© Rob Edmunds

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