Plant Parasites of Europe

leafminers, galls and fungi

Juniperus virginiana

organ parasitic mode stage note taxonomic group parasite
leaf vagrant Tenuipalpidae Pentamerismus oregonensis
leaf vagrant Tenuipalpidae Aegyptobia aletes
leaf vagrant Tetranychidae Oligonychus ununguis
leaf vagrant Tetranychidae Bryobia praetiosa
leaf vagrant Tetranychidae Eurytetranychus admes
leaf vagrant Tetranychidae Tetranychus urticae
leaf vagrant Tenuipalpidae Pentamerismus erythreus
leaf gall Cecidomyiidae Oligotrophus betheli
stem borer Curculionidae Phloeosinus aubei
leaf hidden Phytoptidae Trisetacus chamaecypari
stem scale Pseudococcidae Planococcus vovae
leaf scale Diaspididae Carulaspis minima
leaf scale Diaspididae Carulaspis juniperi
leaf miner Yponomeutidae Argyresthia trifasciata
leaf vagrant Aphididae Cinara juniperi
leaf vagrant Aphididae Cinara fresai
stem pustule telia Pucciniales Gymnosporangium sabinae
stem vagrant Aphididae Cinara cupressi
stem vagrant Aphididae Cinara tujafilina


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 28.v.2023