Knapweed Gall Fly

Urophora jaceana


Over all length 6 to 8mm. The thorax and abdomen are grey, and it has a bright yellow scutellum and broad yellow stripe along the side of the thorax. The wings are white with four black bands across them, the outer two joining along the front edge of the wing.


Anywhere that Black Knapweed is common. Field edges, meadows, marshland.

Status and distribution

Common and widespread throughout Britain. Common in Nottinghamshire and recorded twice at Netherfield Lagoons.

Best time to see

June to August.