Trioza apicalis Foerster, 1848
larvae at the underside of the leaf, causing it to bulge upwards and get disfigured. Larvae dorsoventrally flattened, surrounded by a nimbus of radiating white wax threads.
Leaf curls even occurred in young leaves, that never have been in contact with the psyllids. This demonstrates that the effect of the insects on the plants is systemic. Univoltine, hibernation as adults on conifers.
Daucus carota is the main host plant (Láska, 2011a). Basing himself on a revision of the apicalis species group, Burckhardt (1986a) lists only the species mentioned above as confirmed host plants of apicalis s. str. The same is repeated by Malenkovský & Lauterer (2012a). The species mentioned below, that are listed in the literature for apicalis probably are associated with different species of the apicalis-group (T. anthrisci, carpathica, laserpitii, lautereriella, mesembrina):
Aethusa; Angelica sylvestris; Anthriscus sylvestris; Carum carvi; Chaerophyllum temulum; Coriandrum sativum; Heracleum sphondylium; Laserpitium latifolium; Pastinaca sativa; Petroselinum crispum; Peucedanum ostruthium; Pimpinella anisum, major.
See Burckhardt & Freuler.
den Bieman, Malenovský, Burckhardt & Heijerman (2019a), Buhr (1964a, 1965a), Burckhardt (1983a, 1986a, 2002a), Burckhardt & Freuler (2000a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Hodkinson & White (1979a), Láska (2011a), Malenkovský & Lauterer (2012a), Ossiannilsson (1992a), Redfern & Shirley (2011a), Roskam (2009a, 2019a), Seljak (2006a, 2020a), Spodek, Burckhardt & Freidberg (2017a), Tomasi (2014a), White & Hodkinson (1982a).