Diptera: Anthomyiidae - root-maggot fly Chirosia grossicauda Photographs on Pteridium aquilinum, Bracken Host: Pteridium aquilinum Usually a solitary larva mining the main vein on underside near tip of pinnule, causing a strong downwards roll and discolouration. Pupation occurs in the roll. Most obvious between August and October

Chirosia grossicauda
Broadstone, Dorset. September 2017