Montana Field Guide

Help

Montana Field Guides

Home - Other Field Guides
- Kingdom - Animals - Animalia
  - Phylum - Spiders, Insects, and Crustaceans - Arthropoda
    - Class - Insects - Insecta
      - Order - True Flies - Diptera
        
        Family - (Tephritidae) - Tephritidae
        
        Species - Knapweed Gall Fly - Urophora affinis

Knapweed Gall Fly - Urophora affinis

Biocontrol Species
Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:

External Links

General Description

We do not yet have descriptive information on this species. Please try the buttons above to search for information from other sources.

Observations in Montana Natural Heritage Program Database

Number of Observations: 5

(Click on the following maps and charts to see full sized version) Map Help and Descriptions

Relative Density

Recency

(Observations spanning multiple months or years are excluded from time charts)

Management

Melissa Maggio-Kassner is the coordinator for the Montana Biological Weed Control Project. She can be reached at (406) 258-4223 or mmaggio@missoulaeduplace.org

Useful Links:
Montana Invasive Species website
Montana Biological Weed Control Coordination Project
Montana Department of Agriculture - Noxious Weeds
Montana Weed Control Association
Montana Weed Control Association Contacts Webpage.
Montana Fish, Wildlife, and Parks - Noxious Weeds
Montana State University Integrated Pest Management Extension
Weed Publications at Montana State University Extension - MontGuides

Stewardship Responsibility

References

Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Kearing, S.A. 1996. Spotted knapweed (Centaurea maculosa Lam) : water, nutrients, plant competition, bacteria, and the seed head fly (Urophora affinis Frnfd.). M.Sc. Thesis. Bozeman, MT: Montana State University. 66 p.
- Story, J.M. 1976. A study of Urophora affinis (Diptera: Tephritidae) released on spotted knapweed in Western Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 77 p.
Web Search Engines for Articles on "Knapweed Gall Fly"
Additional Sources of Information Related to "Insects"

Take us with you!

Look for this PDF icon as you search and browse. Click it to build a custom PDF with species shown on that page or for all the species within that taxonomic level. To create your own list of species, use the PDF Creator tool at the bottom of the Advanced Search page.

Here's some links if you want to download a whole group.

Dragonflies / Damselflies

Ferns and allies

Conifers

Flowering Plants (Dicots)

Flowering Plants (Monocots)

Citation for data on this website:
Knapweed Gall Fly — Urophora affinis. Montana Field Guide. Montana Natural Heritage Program. Retrieved on October 31, 2025, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=IIDIP4AB10