Plant Parasites of Europe

leafminers, galls and fungi

Corylus colurna

turkish hazel

organparasitic modestagenotetaxonomic groupparasite
leafdownErysiphalesErysiphe corylacearum
leafvagrantGeometridaeOperophtera brumata
leafvagrantGeometridaeErannis defoliaria
leafhiddenTortricidaeArchips podana
leafhiddenTortricidaeArchips xylosteana
stemborerCurculionidaeHypoborus ficus
leafvagrantCicadellidaeAlebra coryli
stemborerCurculionidaeScolytus multistriatus
stemborerCurculionidaeScolytus pygmaeus
stemborerCurculionidaeScolytus carpini
leafvagrantTetranychidaeBryobia angustisetis
leafvagrantTetranychidaeBryobia rubrioculus
leafvagrantTetranychidaeEotetranychus pruni
leafvagrantEriophyidaeCoptophylla lamimani
leafscaleCoccidaePulvinaria hydrangeae
leaf budgallPhytoptidaePhytoptus avellanae
leafdownErysiphalesPhyllactinia guttata
leafminerGracillariidaeParornix devoniella
leafminerGracillariidaePhyllonorycter coryli
leafminerGracillariidaePhyllonorycter nicellii
leafminerNepticulidaeStigmella microtheriella
leafvagrantEriophyidaeAculus comatus
leafvagrantEriophyidaeTegonotus depressus
stemborerCerambycidaeOberea linearis
leafvagrantAphididaeMyzocallis coryli
leafgallAphididaeCorylobium avellanae


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 19.xii.2021