synonym: Alnus alnobetula

organ parasitic mode stage note taxonomic group parasite
leaf miner Curculionidae Anoplus setulosus
stem scale Diaspididae Chionaspis salicis
stem borer Sesiidae Synanthedon spheciformis
stem vagrant Psyllidae Psylla fusca
stem vagrant Psyllidae Psylla alni
flower gall Taphrinales Taphrina alni
leaf down Erysiphales Erysiphe penicillata
leaf down Erysiphales Erysiphe vernalis
leaf down Erysiphales Phyllactinia alnicola
leaf gall Cecidomyiidae Dasineura tortilis
leaf gall Eriophyidae Acalitus brevitarsus
leaf gall Eriophyidae Eriophyes euryporus
leaf gall Eriophyidae Eriophyes laevis
leaf gall Taphrinales Taphrina viridis
leaf miner Bucculatricidae Bucculatrix cidarella
leaf miner Coleophoridae Coleophora alnifoliae
leaf miner Coleophoridae Coleophora binderella
leaf miner Coleophoridae Coleophora milvipennis
leaf miner Coleophoridae Coleophora serratella
leaf miner Eriocraniidae Eriocrania alpinella
leaf miner Eriocraniidae Paracrania chrysolepidella
leaf miner Gracillariidae Phyllonorycter alpina
leaf miner Gracillariidae Phyllonorycter klemannella
leaf miner Gracillariidae Phyllonorycter rajella
leaf miner Heliozelidae Heliozela resplendella
leaf miner rarely Nepticulidae Ectoedemia minimella
leaf miner Nepticulidae Stigmella alnetella
leaf miner Nepticulidae Stigmella glutinosae
leaf miner Tenthredinidae Fenusa dohrnii
leaf miner Tenthredinidae Fenusa pumila
leaf miner Tenthredinidae Heterarthrus vagans
leaf miner Tenthredinidae Scolioneura betuleti
leaf pustule uredinia telia Pucciniales Melampsoridium betulinum
stem vagrant Aphididae Clethrobius comes
stem vagrant Aphididae Clethrobius comes
stem vagrant Psyllidae Psylla alpina


the part of the plant that most conspicuously is hit by the parasite

all buds: both flower buds and leaf buds
flower: also inflorescence
leaf: also needle, phyllodium, petiole
leaf bud: also unfolding young leaf
fruit: also seed
root: also root stock, runners
root collar: also the lowest part of the stem
stem: also culm, the lower part of the peduncle, in grasses also leaf sheath
systemic: the entire above-ground plant.


borer: larva living internally, almost no outwards signs
down: 0.5-2 mm high fungal down
film: very thin cover of fungal tussue
gall: swelling and/or malformation
grazer: feeding at the outside of the plant
leaf spot discoloured, often ± necrotic, generally not galled, sign of a fungus infection
miner-borer: larve initially makes a mine, lives as a borer later
pustule: plug of fungal tissue, generally brown-black and < 2 mm
stripe: longitudinal line of fungal tissue in a grass leaf
vagrant: (aphids, mites) living freely on the plant, at higher densitiy causing malformations.


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The host plant spectre of a parasite is rarely known exhaustively; this applies in particular at the species level. It is advisable therefore to check at least also the list of all parasites of this genus.