Urophora affinis (Frfld.)

Plant species attacked: Diffuse knapweed | Spotted knapweed
Biocontrol Agent Type: Seed feeding fly
Country of Origin: The populations released in BC originated in the French Rhine Valley
First Released in BC: 1970
Click on image to view larger photo: Urophora affinis larvae in woody seedhead gall Urophora affinis female
Positive monitoring and/or dispersal locations in BC on Diffuse and Spotted knapweed:
(click image to view larger map)
Established Urophora affinis on Diffuse knapweed locations Established Urophora affinis on Spotted knapweed locations
View the in-depth Urophora affinis information page here