Urophora Cardui
      Canada thistle gall fly
      (Diptera: Tephritidae)

     
      Urophora Cardui adult fly
      Photo from: Dr. Alec McClay, Alberta Research Council, [website] Crop and Plant Management Unit Biological Control of
        Weeds using Insects and Mites, 9/15/99  www.arc.ab.ca/crop/weed/ThistleAgent.html#UCAR

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