Cerodontha iridis Hendel, 1927
Iris spuria, Hungary, Budapest, Bikás park, 11.vi.2020 © László Érsek: mine
the frass is unusually oily
the larva lies aligned to the ridges
14.vi.2020: opened mine, with puparia
the puparia lie perpendicular to the ridges
Iris foetidissima, Slovenia © Gabrijel Seljak
Two to 12 eggs are separately inserted in a leaf, not far from the apex. The young larvae begin making a short, narrow, corridor that runs upwards. Soon the direction revers, the corridors quickly become wider and fuse. The result is a large blotchy mine, generally containing several larvae (Venturi, 1946b). The mine is very inconstant in depth, making it to vary, in look through, from green to almost vitreous. Mines contain several lumps of frass. Pupation in the mine. The puparia lie close together in a row, in the lowest part of the mine, oriented perpendicularly to the leaf length.
Iris foetidissima, orientalis, spuria.
Also on other garden irises; not on I. pseudacorus.
Larvae from June-October (Nowakowski, 1973a). In Italy two generations (Venturi, 1946b).
Not recorded in the Benelux countries; this probably is a matter of time, because the species occurs in the surrounding countries, sometimes even attaining pest status (Spencer, 1973b).
distribution within Europe
UK, Germany, France, Italy, Hungary and Portugal (Fauna Europaea); als Czechia, Slovenia.
Described by Nowakowski (1973a).
Phytobia iridis; Ph. iridophaga Hendel, 1931.
Member of the subgenus Dizymomyza (Nowakowski, 1973a).
Černý (2013a), Griffiths (1962a), Hering (1957a), Nowakowski (1973a), Papp & Černý (2016a), Robbins (1991a), Spencer (1953a, 1954d, 1972a, 1973b), Süss (1982a), von Tschirnhaus (1999a), Vála & Rohacek (1983a)