Hatching from whitish eggs, laid in neat groups on the undersides of its larval food plants, (mainly Elm, Lime or Hazel) this caterpillar is easily recogniseable by its striking bright
yellow lattice markings.
They tend to feed in groups until nearly full-grown in August and September after which they pupate on the ground.
They rarely cause any appreciable damage.
The Adult moths fly from June to July at night.