Urophora cardui (L.)

Plant species attacked: Canada thistle
Biocontrol Agent Type: Stem gall-forming fly
Country of Origin: The populations released in BC originated in Austria, Germany, Fance and Finland
First Released in BC: 1987
Click on image to view larger photo: Urophora cardui larvae in thistle stem gall
Positive monitoring and/or dispersal locations in BC on Canada thistle:
(click image to view larger map)
Established Urophora cardui on Canada thistle locations
Download Field Guide: Operational Field Guide - Urophora cardui
View the in-depth Urophora cardui information page here