Botanophila seneciella explained

Botanophila seneciella, the ragwort seed fly or ragwort seed head fly, is a fly species in the family Anthomyiidae.

Larvae feed within seed heads of Jacobaea vulgaris (the tansy ragwort), often destroying all of the developing seeds.^[1] It is also found feeding on Senecio vulgaris (the groundsel).

These flies originated in France.^[2] Together with the cinnabar moth (Tyria jacobaeae) and the tansy ragwort flea beetle (Longitarsus jacobaeae), the ragwort seed fly can be used for the biological control of the tansy ragwort. It has been approved and released for Senecio control in California, Australia and elsewhere.

Notes and References

1. http://invasives.wsu.edu/biological/Botanophilaseneciella.htm Botanophila seneciella at the Integrated Weed Control Project at Washington State University
2. Rees, Norman, et al., Ed., Biological Control of Weeds in the West, Western Society of Weed Science, in Cooperation with USDA ARS, MT Dept. of Ag, and MT State Univ., Color Printers, Bozeman, MT, Feb., 1996.