Psylla alni (Linnaeus, 1758)

on Alnus

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

wax and honeydew

after the was has been partially removed

mature larva, after all wax has been removed

same larva, ventral

5th instar larva (from Ossiannilsson, 1992a)

parasite

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.

hostplants

Betulaceae monophagous

Alnus glutinosa, hirsuta, incana, japonica, viridis.

notes

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

references

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).