Alder Leaf Beetle - Agelastica alni


    Agelastica alni is a distinctive, dark metallic blue coloured species measuring around 7mm in length. It feeds mainly on Alder but is occasionally found on other deciduous trees such as Beech, Hazel and Hornbeam.

    Identification difficulty
    Recording advice

    Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.


    Mainly found on Alder.

    When to see it

    Late spring to autumn.

    Life History

    It overwinters as adults which emerge in the spring, sometimes in large numbers.

    UK Status

    Once a rare beetle which was previously believed to be extinct in the UK. However, there have been an increasing number of recent records and the true status of Agelastica alni, is currently unknown - it has RDB K (Insufficiently known) status.

    VC55 Status

    Rare in Leicestershire and Rutland but probably increasing in our area.

    Leicestershire & Rutland Map

    MAP KEY:

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

    UK Map