organ parasitic mode stage note taxonomic group parasite
stem gall rarely Curculionidae Ceutorhynchus pectoralis
stem gall Curculionidae Ceutorhynchus hirtulus
leaf scale Aleyrodidae Aleyrodes proletella
flower gall Cecidomyiidae Dasineura nasturtii
leaf gall Triozidae Trioza rotundata
leaf vagrant summer generation Aphididae Rhopalosiphum nymphaeae
leaf vagrant summer generation Aphididae Aphis nasturtii
flower gall Cecidomyiidae Contarinia nasturtii
flower gall Cecidomyiidae Dasineura sisymbrii
leaf down Erysiphales Erysiphe cruciferarum
leaf down Erysiphales Leveillula taurica
leaf down Peronosporales Hyaloperonospora nasturtii-aquatici
leaf down Peronosporales Hyaloperonospora rorippae-islandicae
leaf gall Curculionidae Ceutorhynchus chalibaeus
leaf miner Agromyzidae Liriomyza strigata
leaf miner Agromyzidae Phytomyza rufipes
leaf miner Curculionidae Ceutorhynchus minutus
leaf miner Drosophilidae Scaptomyza flava
leaf miner Plutellidae Plutella xylostella
leaf pustule Albuginales Albiginaceae Albugo candida
leaf pustule Albuginales Albiginaceae Albugo rorippae
leaf pustule Blastocladiales Physoderma magnusianum
leaf pustule Blastocladiales Physoderma vagans
leaf pustule Chytridiales Synchytrium aureum
leaf pustule aecia Pucciniales Puccinia isiacae
leaf vagrant summer generation Aphididae Aphis nasturtii
leaf vagrant Aphididae Lipaphis pseudobrassicae
stem borer Chrysomelidae Psylliodes napi
stem borer Curculionidae Aulacobaris lepidii
stem borer Curculionidae Ceutorhynchus pallidactylus
stem borer Curculionidae Ceutorhynchus sulcicollis
stem gall Curculionidae Ceutorhynchus griseus
root collar gall Actinomycetales Rhodococcus fascians
root collar gall Curculionidae Ceutorhynchus assimilis
root collar gall Plasmodiophorales Plasmodiophora brassicae
root gall Heteroderidae Heterodera avenae
root gall Heteroderidae Heterodera goettingiana
root gall Plasmodiophorales Spongospora nasturtii
leaf vagrant Aphididae Sipha glyceriae
leaf vagrant Aphididae Lipaphis erysimi
systemic vagrant summer generation Aphididae Aphis triglochinis
leaf vagrant Aphididae Macrosiphum euphorbiae
leaf vagrant Aphididae Lipaphis erysimi
leaf gall spring generation Aphididae Aphis nasturtii


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.


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 13.iv.2019