Canada Thistle Stem Gall Fly  (three photos)
Urophora cardui

Urophora cardui
This spiffy Fruit Fly was introduced to the U.S. to control Canada Thistle.
I found
it at Pineview Reservoir, Weber County, Utah. ©Carol Davis 6-3-2018

wavy-winged syrphid
It isn't the fly itself that controls the thistle, but the
larva. The adults visit flowers. © Carol Davis 63-2018

looking for food
This really is one of the most handsome of
the all the Fruit Flies; well, maybe not from
this angle.  © Carol Davis 6-3-2018

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