Urophora quadrifasciata (weed bioagent)

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Urophora quadrifasciata female (click on image to enlarge it)
Author(s): Jim Story, Montana State University
Source: IPM Images

Urophora quadrifasciata (weed bioagent) (Meigen) - (knapweed seed head fly)

This seed head fly was introduced into North America against diffuse and spotted knapweed (Centaurea diffusa and Centaurea stoebe micranthos) and is commercially available.

oviposition of Urophora quadrifasciata on Centaurea jacea (click on thumb sign to enlarge)
Source: Wikimedia Commons