Food Plant: Centaurea jacea (Brown Knapweed), C.nigra (Knapweed), Jacobaea vulgaris (Common 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 Jacobaea vulgaris (Common Ragwort).

Agromyzidae Recording Scheme Grade: 4

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

Image:© Barry Warrington

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.