Pear Slug Sawfly - Caliroa cerasi

    Alt Name
    Cherry Slug sawfly

    Adult is black. Body size is 4 to 6 mm; wing span is 6 to 9 mm. Antennae are 9 segmented, black. Legs are black, brownish in middle only. The wing has a darker stigma. The larva is black, slug like and slimy looking.

    Identification difficulty
    Recording advice

    This species has a red ID rating and unless identified by a known expert you must provide a satisfactory explanation of how it was identified for the record to be accepted.


    Associated with various deciduous trees and shrubs including pear, cherry and hawthorn.

    When to see it

    Adult - June and July.

    Life History

    The larvae are important pests that eat the leaves of commercial crops such as cherry, pear, and plum trees, leaving behind a skeleton of veins. The larvae cover themselves in green slime, making themselves unpalatable to predators. When the larvae are fully grown, they drop off the tree on the ground and pupate underground. The adult sawfly emerges from the pupal case and climbs from the soil to mate and lays eggs on the leaves of the host plant, completing the lifecycle.

    UK Status

    Widespread but poorly recorded in Britain.

    VC55 Status

    Status in Leicestershire and Rutland not known.

    Leicestershire & Rutland Map

    MAP KEY:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

    UK Map