Urophora quadrifasciata (Meig.)

Plant species attacked: Black knapweed | Brown knapweed | Diffuse knapweed | Meadow knapweed | Spotted knapweed
Biocontrol Agent Type: Seed feeding fly
Country of Origin: The populations released in BC originated in Caucasus
First Released in BC: Adventive
Click on image to view larger photo: Urophora quadrifasciata larvae in papery seedhead gall Urophora quadrifasciata female
 
Positive monitoring and/or dispersal locations in BC on Diffuse, Meadow and Spotted knapweeds:
(click image to view larger map)
Established Urophora quadrifasciata on Diffuse knapweed locations Established Urophora quadrifasciata on Meadow knapweed locations Established Urophora quadrifasciata on Spotted knapweed locations
 
View the in-depth Urophora quadrifasciata information page here