Phytomyza spinaciae Hendel, 1928
Plant: Carduus (Thistle)
Perennial Cornflower), C.
arvense (Creeping Thistle), C.
Meadow Thistle), C.
Marsh Thistle), C.
vulgare (Spear Thistle), Onopordum (Cotton
Mine: Summer and Autumn
Notes: Forms a long narrow greenish mine. The puparium is white and forms at the end of the mine, underneath the leaf. The adult was reared and emerged 13.viii.2017. A common and widespread miner. These mines are identical to those of P.autumnalis and can only be separated by larval and puparium features. The puparium of P.spinaciae is white whereas P.autumnalis is black - of course, P.spinaciae could be parasitised causing it to blacken. So recording P.autumnalis based on a black puparium isn’t safe, so it is best to rear. P.autumnalis mines occur in October and November, so there may be some overlap with P.spinaciae
Data: 07.viii.2017, Hessle,South-east Yorkshire, VC61
Image:© Barry Warrington