Plant Parasites of Europe

leafminers, galls and fungi

Alnus cordata

italian alder

synonym: Alnus cordifolia, crispa, rotundifolia Bertol.

organparasitic modestagenotetaxonomic groupparasite
leafvagrantMiridaeMimocoris rugicollis
predatorMiridaeDeraeocoris lutescens
leafvagrantTenthredinidaeEuura glutinosae
leafvagrantAphididaePterocallis alni
leafvagrantGeometridaeSolitanea mariae
leafminerCurculionidaeAnoplus setulosus
leafvagrantdoubtfulPhlaeothripidaeLiothrips pragensis
leafvagrantThripidaeThrips major
leafvagrantThripidaeThrips alni
leafhiddenGelechiidaeCarpatolechia proximella
stemvagrantPsyllidaePsylla cordata
leafvagrantAphididaeCrypturaphis grassii
leafminerColeophoridaeColeophora alnifoliae
leafdownErysiphalesErysiphe penicillata
leafdownErysiphalesPhyllactinia alnicola
leafgallEriophyidaeAcalitus brevitarsus
leafgalldoubtfulTaphrinalesTaphrina sadebeckii
leafminerdoubtfulGracillariidaePhyllonorycter froelichiella
leafminerGracillariidaePhyllonorycter rajella
leafminerGracillariidaePhyllonorycter stettinensis
leafminerNepticulidaeStigmella alnetella
leafminerNepticulidaeStigmella glutinosae
leafminerTenthredinidaeFenusa dohrnii
leafminerTenthredinidaeHeterarthrus vagans
leafpustuleuredinia teliaPuccinialesMelampsoridium betulinum
leafpustuleuredinia teliaPuccinialesMelampsoridium hiratsukanum
stemleaf spotPeronosporalesPhytophthora alni
leafvagrantrarelyAphididaePterocallis maculata


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.


Last modified 1.iv.2022