About Cystiphora sonchi (Vallot, 1827)
Cystiphora sonchi (Vallot, 1827) is a species of gall midge that belongs to the family Cecidomyiidae. This species is native to Eurasia, and has been introduced to North America to act as a biological control agent for sow thistles. The larvae of Cystiphora sonchi form small, circular galls on the leaves of their host plants. Multiple species of parasitic wasps use these larvae as hosts. The species was first described under the name Cecidomyia sonchi in 1847 by Swiss entomologist Johann Jacob Bremi-Wolf.
