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Birch Shield Bug

Birch Shield Bug ©Ian A Kirk

Birch shieldbug

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Enw gwyddonol: Elasmostethus interstinctus
As its name suggests, the birch shieldbug can be found feeding on silver birch, and sometimes hazel, in mixed woodland. Adults hibernate over winter, emerging in spring to lay their eggs.

Top facts

Stats

Length: 0.8-1.1cm

Conservation status

Common.

Pryd i'w gweld

May to October

Ynghylch

A smaller relative of the hawthorn shieldbug, adults of the red-and-green birch shieldbug are particularly abundant in the early autumn. They go into hibernation over the winter, emerging again in spring to lay their eggs. The nymphs hatch and develop in summer, feeding on silver birch and sometimes hazel.

What to look for

The birch shieldbug is green, red and brown - similar to the hawthorn shieldbug. But it is smaller, has slightly duller colouration, and does not have the projecting shoulders.

Where to find

Widespread.

Habitats

Roeddech chi yn gwybod?

Most shieldbugs feed on plant sap and, although some can become pests of crops, most gardeners enjoy their presence. To digest the sap, shieldbugs need the help of symbiotic bacteria. To ensure they get the best start in life, the female will smear her eggs with these bacteria so that the young nymphs ingest them as they feed on the egg case.