Ostrinia scapulalis, the adzuki bean borer, adzuki bean worm, is a species of moth in the Crambidae family. It occurs in the Palearctic ecozone, in two apparently disconnected areas: one in the western Palearctic (from western Europe to Russia) and one in the eastern Palearctic (from eastern China to Japan). The larvae mainly feed on Artemisia vulgaris, but may also feed on maize. Before boring the stalks of their host plant, early instar larvae graze young plant tissues that are mostly apical.