Plant Parasites of Europe

leafminers, galls and fungi

genus Thuja

organparasitic modestagenotetaxonomic groupparasite
leafvagrantLasiocampidaePachypasa limosa
leafvagrantGeometridaeEupithecia intricata
stemborerBuprestidaeAcmaeodera bipunctata
stemborerBuprestidaeLamprodila festiva
leafvagrantCicadellidaeHishimonus hamatus
stemborerCurculionidaePhloeosinus henschi
stemborerCurculionidaeXyleborus dispar
rootvagrantCurculionidaePachyrhinus lethierryi
stemborerCurculionidaePhloeosinus aubei
stemborerCurculionidaePhloeosinus thujae
leafhiddenTortricidaeClepsis spectrana
stemvagrantFlatidaeMetcalfa pruinosa
leafmineryounger larvaTortricidaeArchips oporana
leafhiddenolder larvaTortricidaeArchips oporana
flowerhiddenThripidaeFrankliniella intonsa
leafhiddenTortricidaeDitula angustiorana
leafhddenTortricidaeCacoecimorpha pronubana
leafvagrantPhytoptidaeTrisetacus cupressi
stemvagrantEriophyidaeCalepitrimerus occithujae
leafscaleDiaspididaeLineaspis striata
leafscaleDiaspididaeAonidia mediterranea
stemscalePseudococcidaePlanococcus vovae
leafscaleCoccidaeCoccus hesperidum
leafscaleDiaspididaeLepidosaphes juniperi
leafscaleDiaspididaeCarulaspis minima
leafscaleDiaspididaeCarulaspis juniperi
leafleaf spotGelechiidaeGelechia senticetella
stemborerSesiidaeSynanthedon spuleri
leafleaf spotXylarialesPestalotiopsis funerea
leafgallPhytoptidaeTrisetacus thujae
leafminerYponomeutidaeArgyresthia cupressella
leafminerYponomeutidaeArgyresthia thuiella
leafminerYponomeutidaeArgyresthia trifasciata
leafvagrantAphididaeCinara juniperi
leafvagrantEriophyidaeEpitrimerus insons
stemvagrantmainAphididaeCinara cupressi
stemvagrantAphididaeCinara tujafiina
stemscalemainCoccidaeParthenolecanium fletcheri
leafvagrantAphididaeIllinoia morrisoni
stemscaleCoccidaeParthenolecanium corni


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 4.vii.2021