Wingspan of 30-40 mm. Forewings sandy-rufous to purplish red-brown usually with the median area often darker. Dark markings in the shape of the Hebrew character Nun are usually present. Hindwings are pale greyish-brown.
Final instars reach 42-47 mm in length. Body green with fine white dorsal and sub-dorsal lines and a broad white spiracular stripe edged above with black. Head is bright green and spiracles white ringed with black.
Hemispherical, finely ribbed and greenish-white when laid, becoming darker with age. Laid in loose batches.
Europe and parts of Asia.
Orchard trees and broadleaved trees and shrubs.
Larvae defoliate trees and will also feed on developing buds, shoots and fruitlets.