Rhopalomyia florum (Kieffer, 1890)
Artemisia vulgaris, Nieuwendam: gall, between two developing fruits and an abortive one
opened gall with larvs
parasitised gall (contained a dead chalcid wasp)
Artemisia vulgaris, Nieuwedam; at left a normal fruit, at right a galled one
emptied and vacated gall
Asteraceae, narrowly monophagous
Artemisia maritima, vulgaris.
The flower heads containing a gall cannot be distinguished from normal heads. The only way to find the galls is by random insepection of ripe flower heads. In my expeprience the galls are not at all rare – tens of galls per plant.
see also Rh. magnusi, treated by Buhr as a more or less forgotten species.
Buhr (1964b), Dauphin & Aniotsbehere (1997a), Gagné (2010a), Redfern & Shirley (2011a), Roskam (2009a), Roskam & Carbonnelle (2015a), Simova-Tošić, Skuhravá & Skuhravý (2000a), Skuhravá & Skuhravý (1999a), Skuhravá, Skuhravý, Dauphin & Coutin (2005a), Skuhravá, Skuhravý & Meyer (2014a).