Psylla alni is a species of psyllid, a plant-feeding hemipteran in the family Psyllidae. It is the type species of Psylla, which is the type genus in its family.
Distribution This species is present in the Palearctic realm (from Europe to Siberia and Sakhalin, Kazakhstan, Caucasus) and in the Nearctic realm (Canada and United States of America). Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. Catalogue of LifeFauna Europaea
Description Psylla alni can reach a body length of about . These rather large psyllids have a green head, body, and legs, and rather long antennae. The costal marginal veins of the wings are green, while the other veins are brown. Adults are initially green, later becoming orange, brown, or reddish. The nymphs are usually covered by white waxy secretions.British Bugs In the 5th preimaginal stage nymphs can reach a length of about .
Biology Adults can be found from June to October. This species has one generation a year (univoltine) and overwinters as an egg.
It is monophagous on most Betulaceae (Alnus glutinosa, Alnus hirsuta, Alnus incana, Alnus japonica, Alnus viridis). Larvae feed on young shoots in the leaf axils.Plant Parasites of Europe
References Linné C. (1758) Systema Naturae, 1: 824 pp. Editio decima, reformata, Stockholm (Sweden). Psyl'list: Psylloidea database. Ouvrard D.,
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