organ parasitic mode stage note taxonomic group parasite
leaf scale Aleyrodidae Trialeurodes vaporariorum
leaf miner Agromyzidae Chromatomyia horticola
leaf vagrant Aphididae Aphis spiraecola
leaf vagrant summer generation Aphididae Aphis fabae
leaf vagrant Aphididae Aphis gossypii
leaf down Erysiphales Golovinomyces orontii
leaf down Erysiphales Podosphaera macularis
leaf down Peronosporales Pseudoperonospora cubensis
leaf gall summer generation Aphididae Phorodon humuli
leaf miner doubtful Agromyzidae Agromyza anthracina
leaf miner Agromyzidae Agromyza flaviceps
leaf miner Agromyzidae Agromyza igniceps
leaf miner Coleophoridae Coleophora violacea
leaf miner Cosmopterigidae Cosmopterix zieglerella
leaf miner Gracillariidae Caloptilia fidella
leaf miner Noctuidae Hypena proboscidalis
leaf miner Tortricidae Cnephasia incertana
leaf pustule Chytridiales Synchytrium aureum
leaf vagrant rarely Choreutidae Anthophila fabriciana
stem borer Crambidae Ostrinia nubilalis
root gall Heteroderidae Heterodera humuli
leaf vagrant Aphididae Aulacorthum circumflexum
leaf vagrant Aphididae Myzus ascalonicus


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 28.ii.2019