Plant Parasites of Europe

leafminers, galls and fungi

Polygonum aviculare

knotgrass

synonym: Polygonum heterophyllum, neglectum

organparasitic modestagenotetaxonomic groupparasite
leafvagrantGeometridaeIdaea efflorata
leafvagrantGeometridaeScopula emutaria
leafvagrantGeometridaeRhodometra sacraria
leafvagrantGeometridaeIdaea completa
leafvagrantGeometridaeLythria purpuraria
leafvagrantGeometridaeXanthorhoe spadicearia
leafvagrantGeometridaeTimandra comae
leafvagrantChrysomelidaeGaleruca melanocephala
leafvagrantCicadellidaeMacrosteles maculosus
leafvagrantCicadellidaeOphiola decumana
leafvagrantrarelyChrysomelidaeGastrophysa viridula
leafvagrantChrysomelidaeAltica oleracea
rootborerChrysomelidaeChaetocnema concinna
rootborerChrysomelidaeChaetocnema tibialis
leafvagrantChrysomelidaeGastrophysa polygoni
leafvagrantTenthredinidaeAmetastegia equiseti
leafvagrantTenthredinidaePachyprotasis rapae
leafvagrantTenthredinidaeDulophanes morio
leafvagrantTenthredinidaeAmetastegia glabrata
rootborerlarvaCurculionidaeAmalus scortillum
leafvagrantlarvaCurculionidaePelenomus quadrituberculatus
unknownvagrantlarvadoubtfulCurculionidaeNeophytobius muricatus
unknownvagrantlarvadoubtfulCurculionidaeNeophytobius quadrinodosus
stemborerlarvaCurculionidaeRhinoncus perpendicularis
root collarborerlarvaCurculionidaeRhinoncus bruchoides
stemborerlarvaApionidaePerapion lemoroi
stemgallMicrobotryalesMicrobotryum nepalense
leafvagrantsummer generationAphididaeRhopalosiphum padi
leafvagrantAphididaeSitobion avenae
leafvagrantsummer generationAphididaeMyzus persicae
stemborerGelechiidaeMonochroa hornigi
fruitvagrantColeophoridaeColeophora aestuariella
systemicborerAnguinidaeDitylenchus dipsaci
flowergallMicrobotryalesMicrobotryum aviculare
flowergallUstilaginalesMelanopsichium austro-americanum
flowergallUstilaginalesMelanopsichium pennsylvanicum
leafdownErysiphalesLeveillula taurica
leafdownPeronosporalesPeronospora polygoni
leafleaf spotdoubtfulEntylomatalesEntyloma polygoni-amphibii
leafgallAphididaeAspidaphis adjuvans
leafgallrarelyCecidomyiidaeWachtliella persicariae
leafgallPsyllidaeAphalara avicularis
leafminermainChrysomelidaeMantura rustica
leafminerCurculionidaeHypera rumicis
leafminerPsychidaeApterona helicoidella
leafminerTortricidaeCnephasia lineata
leafpustuleaecia uredinia teliaPuccinialesUromyces polygoni-avicularis
leafvagrantsummer generationAphididaeBrachycaudus amygdalinus
stemdownmainErysiphalesErysiphe polygoni
stemgallColeophoridaeAugasma aeratella
rootgallMeloidogynidaeMeloidogyne hapla
leafvagrantsummer generationAphididaeAphis fabae
leafvagrantrarelyAphididaeSitobion avenae
leafvagrantAphididaeAphis polygonata

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.

 

Last modified 4.vi.2021