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Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

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Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

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Species Urophora cardui - Canada Thistle Stem Gall Fly

Urophora cardui on goldenrod - Urophora cardui - female Rhagoletis? - Urophora cardui Tephritidae: Urophora? - Urophora cardui - male Tephritidae: Urophora? - Urophora cardui - male Fly - Urophora cardui Fruit fly? - Urophora cardui  Canada Thistle Stem Gall Fly (Urophora cardui) - Urophora cardui Urophora cardui
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Acalyptratae")
Superfamily Tephritoidea
Family Tephritidae (Fruit Flies)
Subfamily Tephritinae
Tribe Myopitini
Genus Urophora
Species cardui (Canada Thistle Stem Gall Fly)
Explanation of Names
Urophora cardui (Linnaeus 1758)
Range
native to central and southern Europe; introduced to North America for weed control(1)
Food
Canada Thistle (Cirsium arvense)(1)
Life Cycle
One to thirty eggs are laid in stems during plant's growing season. Overwinters in the third instar, mature larva, within a stem gall on Canada thistle. Pupates in early spring.

Larvae
Remarks
Release has been approved by the Animal and Plant Health Inspection service (Canada). It is no threat to non target species. Thistle is reduced by as much as 48% and grasses and forbs return to previously infested areas.
Internet References