Berberis Fusehorn Arge berberidis


Family Argidae (Fused-horned sawflies) » Arge berberidis Schrank, 1802
Length 7-11 mm. One of the 4 black-bodied Arge species found in Britain with darkened wings and entirely dark legs which are difficult to tell a part without specialist knowledge and a microscope. Separable from the 3 similar species by the tranversely striate tergites and (in the female) by the forceps-shaped saw-sheath. The larva feed on the leaves of Berberis (esp. thunbergii) and Mahonia, and may cause serious defoliation. The adult flies in 2-3 generations per year from May to October. A relatively recent arrival in Britain, becoming established in SE England in 2000. It has spread over much of the UK.


Berberis Fusehorn Arge berberidis female
Berberis Fusehorn Arge berberidis female

Back garden, South Staffordshire. 4th August 2020. Photos © Peter Hillman. Species identification confirmed and recorded by an expert from iRecord.