Plant Parasites of Europe

leafminers, galls and fungi

Persicaria dubia

tasteless water-pepper

synonym: Polygonum mite; Persicaria mitis

organ parasitic mode stage note taxonomic group parasite
leaf vagrant larva Curculionidae Pelenomus waltoni
leaf vagrant larva Curculionidae Pelenomus quadricorniger
stem borer larva Curculionidae Rhinoncus perpendicularis
root collar borer larva Curculionidae Rhinoncus bosnicus
systemic borer Anguinidae Ditylenchus dipsaci
flower gall Microbotryales Microbotryum cordae
flower gall Microbotryales Sphacelotheca hydropiperis
leaf down Erysiphales Leveillula taurica
leaf down Peronosporales Peronospora polygoni
leaf gall Aphididae Aspidaphis adjuvans
leaf gall Psyllidae Aphalara freji
leaf miner Chrysomelidae Mantura rustica
leaf pustule aecia uredinia telia Pucciniales Uromyces polygoni-avicularis
leaf pustule uredinia telia Pucciniales Puccinia polygoni-amphibii
stem down Erysiphales Erysiphe polygoni


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.


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