field pepperwort

organ parasitic mode stage note taxonomic group parasite
fruit borer larva Curculionidae Ceutorhynchus parvulus
fruit borer larva Curculionidae Ceutorhynchus posthumus
stem gall rarely Curculionidae Ceutorhynchus pectoralis
fruit borer rarely Curculionidae Ceutorhynchus turbatus
leaf vagrant summer generation Aphididae Myzus persicae
leaf vagrant Aphididae Macrosiphum euphorbiae
leaf vagrant Aphididae Lipaphis erysimi
leaf down Erysiphales Erysiphe cruciferarum
leaf down Peronosporales Hyaloperonospora parasitica
leaf down Peronosporales Perofascia lepidii
leaf gall Curculionidae Ceutorhynchus chalibaeus
leaf miner Curculionidae Ceutorhynchus minutus
leaf pustule Albuginales Albiginaceae Albugo lepidii
leaf pustule aecia Pucciniales Puccinia isiacae
stem gall main Curculionidae Ceutorhynchus carinatus
stem gall Curculionidae Ceutorhynchus coerulescens
root collar gall Curculionidae Ceutorhynchus assimilis
root collar gall Plasmodiophorales Plasmodiophora brassicae


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 30.v.2019