Pegomya laticornis (Fallén, 1825)
Arctium lappa, Hungary, Mosonmagyaróvár, 17.v.2020 © László Érsek
underside of the mine; accumulation of frass next to the midrib results in a characteristic discolouration
opened mine with larvae
larva, mouth field
larva, anal region
Arctium spec., Britain, Norfolk, Narborough, 25.vi.2018 © Rob Edmunds
Arctium sp., Kekerdom
Arctium sp., Groeningse Berg: heavy infestation
Arctium sp., Nieuwendam
The mine begins at the leaf underside, close to a heavy vein, at a white egg shall that remains in place even in fully developed mines. Often several eggs at distances of about 1 cm along the vein. Each larva makes a large blotch without a preceding corridor. Almost all frass is concentrated in a big mass in the the initial part of the mine. In this part the mine is lower-surface (therefore one sees green leaf tissue overlying the frass mass), but further on the mine is upper-surface, in fact almost full depth and very transparant. In fresh mines remnants of the parenchyma are visible as secondary feeding lines. Often the older mines coalesce. Pupation outside the mine.
Arctium lappa, minus, tomentosum.
Larvae in June-July (Hering, 1957a).
BE not recorded (Fauna Europaea, 2008).
NE recorded (de Meijere, 1939a, as genupuncta).
LUX not recorded (Fauna Europaea, 2008).
distribution within Europe
From Sweden to the Pyrenees, and from the UK to Russia and Romania (Fauna Europaea, 2008); also Slovenia (Maček, 1999a).
Pegomya genupuncta (Stein, 1906).
Dempewolf (per. comm.) observed that during bright weather the larvae retreat to the part of the mine closest to the vein, where also the frass is concentrated; only in overcast or rainy weather they venture far in the mine. Also when disturbed they retreat to their frass fortress.
Ahr (1966a), Beiger (1955a, 1960a, 1979a), Beuk, Prijs & de Jong (2002a), Buhr (1933a, 1964a), Dušek (1970a), Hering (1921a, 1924a, 1957a), Huber (1969a), Kabos (1975a), Kvičala (1938a), Maček (1999a), de Meijere (1939a), Michalska (19070a, 1976a), Niblett (1956a), Nowakowski (1954a), Robbins (1991a), Skala (1936a), Skala & Zavřel (1945a), Sønderup (1949a), Stammer (2016a), Starý (1930a), Teschner (1999a), Ureche (2010a), Zoerner (1969a).