Terellia virens (Loew)

Plant species attacked: Diffuse knapweed | Spotted knapweed
Biocontrol Agent Type: Seed feeding fly
Country of Origin: The populations in BC originated in Swiss Valais and Austria
First Released in BC: 1991
Click on image to view larger photo: Terellia virens larva Terellia virens adult
 
Positive monitoring and/or dispersal locations in BC on Spotted knapweed:
(click image to view larger map)
Established Terellia virens on Spotted knapweed locations
 
This biocontrol agent is currently not available for distribution
View the in-depth Terellia virens information page here