Urophora jaceana (Hering, 1935)
on Centaurea

Centaurea jacea, Belgium, prov. East Flanders, Overboelare, Geraardsbergen, 26.ix.2015 @ Bart Uitterhaegen: vertically enlarged receptacle with three opened gall chambers

larva, head downwards, in the gall chamber
gall
one or more larvae (maggots) live, each in its own vertical cell, in the upwards thickened and lignified receptacle; here also the pupation takes place. Because the gall acts as a nutrient sink, the plant’s vitality is reduced.
host plants
Asteraceae, narrowly monophagous
Centaurea calcitrapa, hanrii subsp. spinabadia, iberica, jacea, nigra, phrygia, solstitialis.
synonyms
Euribia jaceana.
notes
The gall can be found by pinching the old flower heads in autumn.
references
Baugnée (2006a), Béguinot (2001c), Buhr (1964b), Dauphin & Aniotsbehere (1997a), Flügel (2016a), Khaghaninia & Gharajedaghi (2012a), Khaghaninia, Gharajedaghi, Zarghani & Pour Abad (2012a), Kütük, Yaran, Torbali, ao (2019a), Lutovinovas (2014a), Máca (2012a), Neuenschwander & Freidberg (1983a), Niblett (1940a), Redfern & Shirley (2011a), Roskam (2009a), Smnit (2010a), Spooner & Bowdrey (2012a), White (1988a), White & Korneyev (1998a).