The willow gall sawfly has been introduced to Australia. It originates from Europe and Western Asia. It lays eggs in willow leaves and causes red/green galls.
Kay, M.K. 1980: Pontania proxima (Lepeletier) (Hymenoptera: Tenthredinidae). Willow gall sawfly. New Zealand Forest Service, Forest and Timber Insects in New Zealand No. 45.