Arge ochropus (Gmelin, 1790)

Arge ochropus

One of two yellow abdomened species that lack a black blotch under the stigma. Arge ochropus can be separated from Arge pagana by the yellow pronotum and tegulae and yellow legs with black rings on the apices of the tibiae and tarsi. In Arge pagana these body parts are suffused with black. Athalia spp. are often misidentified as this species.

Larvae feed on roses and are difficult to separate from Arge pagana larvae. The hairs on the head of the larvae of ochropus are black, whereas in pagana the hairs are pale. Eggs are laid in a single row (visible in the twig scar), whereas eggs are laid in a double row in pagana.

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Status: Locally common

Distribution: England

Flight period: Uni- or bivoltine, June to August

Plant associations: Rosa spp. (roses)

References:

Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London

Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168