Alder Leaf Beetle

Agelastica alni


Body length 7mm. A bright metallic blue beetle with light puncture marks on the elytra.


The adults and larvae feed mainly on Alder although other trees such as Hazel and Goat Willow can be used as food plants. They skeletonise the leaves as they feed.

Status and distribution

Once thought to be extinct in Britain. They are thought to be migratory and there are now two populations developing, one in the south and one in the Midlands. Where it is found it can be abundant, but is still local. Common in Nottinghamshire and recorded once at Netherfield Lagoons.

Best time to see

April to August.