amphibious bistort

synonym: Polygonum amphibium

organ parasitic mode stage note taxonomic group parasite
leaf vagrant larva Curculionidae Pelenomus quadricorniger
unknown vagrant larva doubtful Curculionidae Neophytobius muricatus
unknown vagrant larva doubtful Curculionidae Neophytobius quadrinodosus
stem borer larva Curculionidae Rhinoncus albicinctus
stem borer larva Curculionidae Rhinoncus perpendicularis
root borer larva Curculionidae Rhinoncus inconspectus
root gall doubtful Curculionidae Bothynoderes affinis
stem vagrant Aphididae Aphis craccivora
leaf down Erysiphales Leveillula taurica
leaf gall Cecidomyiidae Wachtliella persicariae
leaf gall Psyllidae Aphalara borealis
leaf gall Psyllidae Aphalara freji
leaf gall Psyllidae Aphalara maculipennis
leaf miner Anthomyiidae Pegomya bicolor
leaf miner Gracillariidae Calybites phasianipennella
leaf pustule uredinia telia Pucciniales Puccinia polygoni-amphibii
leaf vagrant summer generation Aphididae Aphis nasturtii
stem down Erysiphales Erysiphe polygoni
stem gall doubtful Curculionidae Pelenomus velaris

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 11.vii.2019