organ parasitic mode stage note taxonomic group parasite
fruit borer doubtful Tortricidae Spatalistis bifasciana
fruit borer Tortricidae Eupoecilia ambiguella
leaf gall Eriophyidae Shevtchenkella bulgarica
leaf scale Coccidae Pulvinaria hydrangeae
leaf down Erysiphales Erysiphe tortilis
leaf down Erysiphales Phyllactinia corni
leaf gall spring generation Aphididae Anoecia corni
leaf gall Cecidomyiidae Craneiobia corni
leaf gall Tenuipalpidae Cenopalpus spinosus
leaf miner Agromyzidae Phytomyza agromyzina
leaf miner Coleophoridae Coleophora ahenella
leaf miner Heliozelidae Antispila metallella
leaf miner main Heliozelidae Antispila treitschkiella
leaf vagrant Eriophyidae Anthocoptes cornicolus
leaf vagrant Eriophyidae Anthocoptes platynotus
leaf vagrant Eriophyidae Shevtchenkella glabratae
leaf vagrant Eriophyidae Tegonotus acutilobus
stem gall Santalaceae Viscum album
stem scale Coccidae Parthenolecanium 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.


mod 29.x.2019