The Cabbage Webworm or Old World Webworm (Hellula undalis) is a moth of the Crambidae family. It is a widespread species which is found from Europe across Asia to the Pacific. It was first described from Italy. The wingspan is about 18 mm. Adult moths have fawn forewings, each with sinuous pale lines and a kidney-shaped mark. The hindwings are a uniform grey darkening at the margins. Pupation occurs within this silken shelter. The pupa is formed in a loose cocoon of webbed-together particles of soil or other matter and is about 8 mm long, shining pale brown with a dark stripe on the back.