Caliroa cerasi (Linnaeus, 1758)

Caliroa cerasi

An entirely black insect. The third antennal segment about as long as the fourth and fifth combined. All legs entirely black. Males very rare.

Larvae are mucus covered " slugworms" that feed initially on the upperside of leaves. Pear and cherry are preferred. They pupate in the ground and emerge after 2-3 weeks, or overwinter to emerge the following May.

 

Size: 4 - 6mm

Status: Widespread

Distribution: England, Scotland, Wales, Ireland

Flight period: Bivoltine, May to September

Plant associations: Polyphagous, especially on Pyrus spp. and Prunus spp. (various trees and shrubs esp. pears and cherries.)

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