organ parasitic mode stage note taxonomic group parasite
leaf hidden Tortricidae Archips xylosteana
fruit borer rarely Tortricidae Cydia splendana
fruit borer doubtful Tortricidae Cydia pomonella
stem gall Hypocreales Neonectria ditissima
leaf vagrant Tenuipalpidae Brevipalpus obovatus
leaf vagrant Diptilomiopidae Apodiptacus cordiformis
leaf vagrant Eriophyidae Shevtchenkella juglandis
leaf vagrant Eriophyidae Aculus arzakanensis
leaf vagrant Eriophyidae Aculus fascigrans
leaf vagrant Eriophyidae Aculus juglandis
leaf vagrant Eriophyidae Aculus pulaviensis
leaf vagrant Eriophyidae Aculus marinkovici
leaf vagrant Eriophyidae Aculus nigrus
stem vagrant Aphididae Stomaphis quercus
leaf gall Eriophyidae Aceria brachytarsus
stem scale Diaspididae Lepidosaphes ulmi
stem scale Diaspididae Lepidosaphes conchiformis
stem scale Coccidae Eulecanium tiliae
stem borer Sesiidae Synanthedon vespiformis
leaf vagrant Tenuipalpidae Cenopalpus pulcher
stem vagrant Aphididae Stomaphis juglandis
root collar vagrant Aphididae Stomaphis wojciechowskii
fruit gall Tephritidae Rhagoletis completa
leaf down Microstromatales Pseudomicrostroma juglandis
leaf gall Eriophyidae Aceria avanensis
leaf gall Eriophyidae Aceria erinea
leaf gall Eriophyidae Aceria tristriata
leaf miner Gracillariidae Caloptilia roscipennella
leaf miner Heliozelidae Coptodisca lucifluella
leaf vagrant Aphididae Chromaphis juglandicola
leaf vagrant Aphididae Panaphis juglandis
leaf vagrant Eriophyidae Aculops unguiculatus
leaf vagrant Eriophyidae Phyllocoptes juglandivagrans
stem scale Diaspididae Epidiaspis leperii
stem gall Santalaceae Viscum album
stem scale Coccidae Parthenolecanium corni
leaf leaf spot Diaporthales Ophiognomonia leptostyla


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.


mod 2.xii.2019