Chaetorellia acrolophi (White & Marq.)

Plant species attacked: Diffuse knapweed | Spotted knapweed
Biocontrol Agent Type: Seedhead feeding fly
Country of Origin: The populations in BC originated in Valais, Switzerland
First Released in BC: 1991
Click on image to view larger photo: Chaetorellia acrolophi larvae in knapweed seedhead
 
Positive monitoring and/or dispersal locations in BC on Diffuse and Spotted knapweed:
(click image to view larger map)
Established Chaetorellia acrolophi on Diffuse knapweed locations Established Chaetorellia acrolophi on Spotted knapweed locations
 
View the in-depth Chaetorellia acrolophi information page here