Plant Parasites of Europe

leafminers, galls and fungi

Psylla alni

Psylla alni (Linnaeus, 1758)

on Alnus

Psylla alni: wax wool on Alnus incana

Alnus incana, Hungary, Kimle, 23.iv.2018 © László Érsek

Psylla alni: wax wool on Alnus incana

wax and honeydew

Psylla alni: wax wool and larva on Alnus incana

after the was has been partially removed

Psylla alni: mature larva

mature larva, after all wax has been removed

Psylla alni: mature larva

same larva, ventral

Psylla alni: 5th instar larva

5th instar larva (from Ossiannilsson, 1992a)


Larvae on young shoots in the leaf axils. They are hidden under a copious amount of shining-white wax-wool. Older larvae are marked with black. Univoltine; hibernation as egg.


Betulaceae monophagous

Alnus glutinosa, hirsuta, incana, japonica, viridis.


ovipostion inside a bud. This requires perforation of the bud scales, resulting in a small necrotic spot (Lauterer, 1976a).


Abras, Fassotte, Chandelier & Cavelier (2008a), Baugnée, Burckhardt & Fassotte (2002a),den Bieman, Malenovský, Burckhardt & Heijerman (2019a), Buhr (1964b), Burckhardt (1983a, 2002a), Conci, Rapisarda & Tamanini (1992a), Hellrigl (2004a), Hodkinson (1989a), Hodkinson & White (1979a), Jerinić-Prodanović (2010a), van Klink (2014a), Lauterer (1976a), Lauterer & Dorow (2010a), Malenovský, Baňař & Kment (2011a), Malenkovský & Lauterer (2012a), O’Connor & Malumphy (2011a), Ossiannilsson (1992a), Ouvrard, Burckhardt & Cocquempot (2015a), Rapisarda, Weigand, Braun & Eickermann (2022a), Seljak (2006a, 2020a), Serbina, Burckhardt & Borodin (2015a), White & Hodkinson (1982a).

Last modified 12.viii.2022