This gall was found about 60 cm above ground on the woody stem of a large plant of Senecio sylvaticus L. The only record from S. jacobaea occured when 9 flies when reared from galls on 7 of 15 plants collected Oct. 8, 1969, near Fort Bragg. All the galls made by the larvae on S. jacobaea were on the upper portion of the root crowns and frequently on one side where the feeding usually killed a few leaves but did not seriously injure the plants. However, 1 gall was at the top center of a root crown, and on this plant, the larval feeding killed the growing tip above the gall and then the whole plant. Galls measured 5-9 mm diam.

- Kenneth E. Frick: (1972) Third List of Insects that Feed upon Tansy Ragwort, Senecio jacobaea, in the Western United States^©