Older caterpillars reach up to 4cm in length and have a greenish-yellow body with thick black and thin white stripes along the length of the body.
The adult moth usually has white wings with a faintly iridescent brown border, although the wings can be completely brown or clear with a wingspan of around 4cm.
The caterpillars eat box leaves and produce webbing over their feeding area.
Plants may also show patches of dieback which may be especially apparent on trimmed plants, but be careful now to confuse this with dieback caused by the disease known as box blight.
Caterpillars are also capable of stripping bark as they take over the whole hedge.