Food Plant: Centaurea jacea (Brown Knapweed), C.nigra (Knapweed), Senecio jacobaea (Ragwort). Elsewhere: C.scabiosa (Greater Knapweed), Tragopogon sp. (Salsify)

Mine: unknown

Notes: An internal stem borer in Knapweed species. The puparium is a greyish white (as shown) and the posterior spiracles almost touch, having a strong central horn, surrounded by an ellipse of 15 bulbs. The adult was reared to confirm identity, from C.nigra.(Knapweed). It was also reared from S.jacobaea.

Data: xi.2018, Hull, South-east Yorkshire, VC61

Image:© Barry Warrington

Recording Grade: 4

References:
Kunin, W E (1999). Patterns of herbivore incidence on experimental arrays and field populations of Ragwort, Senecio jacobaea. Oikos 84(3): 515-525
Papp L & Cerný M (2015), Agromyzidae (Diptera) of Hungary,1, Agromyzinae
Spencer, K A (1976) - The Agromyzidae of Fennoscandia and Denmark.