water-cress

synonym: Rorippa nasturtium-aquaticum

organ parasitic mode stage note taxonomic group parasite
stem borer larva Curculionidae Drupenatus nasturtii
fruit borer larva Curculionidae Amalorrhynchus melanarius
stem borer larva Curculionidae Poophagus sisymbrii
stem borer larva doubtful Curculionidae Ceutorhynchus pervicax
stem borer larva Curculionidae Ceutorhynchus pandellei
fruit borer larva Curculionidae Ceutorhynchus cochleariae
root collar borer larva Curculionidae Lixus myagri
stem gall Curculionidae Ceutorhynchus hirtulus
leaf gall Triozidae Trioza rotundata
leaf vagrant summer generation Aphididae Rhopalosiphum nymphaeae
flower gall Cecidomyiidae Contarinia nasturtii
leaf down Peronosporales Hyaloperonospora nasturtii-aquatici
leaf miner Agromyzidae Liriomyza strigata
leaf miner Curculionidae Ceutorhynchus minutus
leaf miner Drosophilidae Scaptomyza flava
leaf pustule Albuginales Albiginaceae Albugo candida
leaf vagrant summer generation Aphididae Aphis nasturtii
stem borer Chrysomelidae Psylliodes napi
stem borer Curculionidae Ceutorhynchus sulcicollis
root collar gall Curculionidae Ceutorhynchus assimilis
root gall Plasmodiophorales Spongospora nasturtii
leaf vagrant Aphididae Lipaphis erysimi
systemic vagrant summer generation Aphididae Aphis triglochinis

Organ

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.

PARASITIC MODE

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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IMPORTANT

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 30.v.2019