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Phytomyza autumnalis Griffiths, 1959 [Diptera: Agromyzidae] Phytomyza autumnalis Griffiths, 1959. Entomologist's Gaz. 10: 103. Phytomyza autumnalis Griffiths, 1959; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 88, 112, 113. Phytomyza autumnalis Griffiths, 1959; Spencer, 1990. Host specialization in the World Agromyzidae (Diptera) : 251, 255.

Leaf-mine: Mine long, distinctly greenish. Pupation in mine (Spencer, 1972b: 88). Mine of Phytomyza autumnalis on Centaurea nigra (Spencer Collection). Image: Brian Pitkin Larva: Details unknown. Puparium: White in early generations and black and shiny in autumn (Spencer, 1976: 504), posterior spiracles each with 20-25 bulbs (Griffiths, 1959: 103). Comments: Spencer (1972b: 88) suggested that the miner on Centaurea may be distinct from that on Cirsium even though the male genitalia appear to be identical. Hosts in Britain: Asteraceae       Centaurea montana Perennial Cornflower Robbins, 1991: 122 Centaurea nigra Common Knapweed Mines in BMNH Centaurea nigra Common Knapweed Robbins, 1991: 122 Centaurea nigra Common Knapweed Spencer, 1972b: 112 ? Cirsium arvense Creeping Thistle Mines in BMNH ? Cirsium arvense Creeping Thistle Spencer, 1972b: 112 ? Cirsium palustre Marsh Thistle Spencer, 1972b: 112 ? Cirsium vulgare Spear Thistle Mines in BMNH ? Cirsium vulgare Spear Thistle Spencer, 1972b: 113 Hosts elsewhere: Asteraceae       Centaurea nigra Common Knapweed Griffiths, 1959: 103 Centaurea nigra Common Knapweed Spencer, 1990: 251 Centaurea scabiosa Greater Knapweed Nederlandse bladmineerders Onopordum     Griffiths, 1959: 103 Onopordum acanthium Cotton thistle Nederlandse bladmineerders Time of year - mines: October-November (Spencer, 1990). Time of year - adults: Unknown. Distribution in Great Britain & Ireland: Common and widespread (Spencer, 1972b: 88) including Warwick (Robbins, 1991: 122). Also recorded in the Republic of Ireland: Co. Tipperary (Tipperary) (Spencer, 1972b: 88). NBN Distribution maps of known host species: Distribution elsewhere: Europe including Germany (Nederlandse bladmineerders), Republic of Moldova and Poland (Martinez in Fauna Europaea). Parasitoids: Unknown.

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Last updated 14-Dec-2008  Brian Pitkin