Centaurea jacea, Belgium, prov. East Flanders, Overboelare, Geraardsbergen, late september @ Bart Uitterhaegen: vertically enlarged receptacle with three opened gall chambers
larva, head downwards, in the gall chamber
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.
Asteraceae, narrowly monophagous
Centaurea hanrii subsp. spinabadia, jacea, nigra, phrygia.
The gall can be found by pinching the old flower heads in autumn.
Baugnée (2006a), Béguinot (2001c), Buhr (1964b), Dauphin & Aniotsbehere (1997a), Flügel (2016a), Khaghaninia, Gharajedaghi, Zarghani & Pour Abad (2012a), Lutovinovas (2014a), Máca (2012a), Niblett (1940a), Redfern & Shirley (2011a), Roskam (2009a), Smnit (2010a), Spooner & Bowdrey (2012a), White (1988a), White & Korneyev (1998a).