Plant Parasites of Europe

leafminers, galls and fungi

Juncus effusus


synonym: Juncus communis

organparasitic modestagenotetaxonomic groupparasite
leafleaf spotPhaeosphaeriaceaeSeptoriella junci
leafleaf spotMycosphaerellaceaeCercospora juncina
leafdownMycosphaerellaceaePseudocercosporella junci
seedsvagrantLygaeidaePeritrechus angusticollis
predatorNabidaeHimacerus boops
leafvagrantLygaeidaeCymus glandicolor
predatorMiridaeTytthus pygmaeus
leafvagrantLygaeidaeCymus melanocephalus
leafvagrantMiridaeCalocoris roseomaculatus
predatorMiridaeTytthus pubescens
stemborerNoctuidaeCoenobia rufa
leafvagrantNoctuidaeAntitype chi
leafvagrantNoctuidaeSimyra albovenosa
stemborerAnthomyzidaeAnagnota bicolor
stemborerAnthomyzidaeStiphrosoma sabulosum
rootvagrantPallopteridaePalloptera scutellata
stemborerAnthomyzidaeStiphrosoma laetum
leafvagrantCicadellidaeConosanus obsoletus
leafvagrantDelphacidaeMuellerianella fairmairei
leafvagrantDelphacidaeConomelus sagittifer
leafvagrantDelphacidaeFlorodelphax leptosoma
leafvagrantDelphacidaeConomelus anceps
leafvagrantDelphacidaeMegamelodes lequesnei
leafvagrantDelphacidaeConomelus lorifer
root collarborerCurculionidaeLimnobaris t-album
unknownunknownCurculionidaeLimnobaris dolorosa
rootgalldoubtfulEntorrhizalesJuncorrhiza casparyana
rootborerChrysomelidaeChaetocnema subcoerulea
stemborerChloropidaeMicrocercis trigonella
leafmineryounger larvaTenthredinidaeEutomostethus luteiventris
leafvagrantolder larvaTenthredinidaeEutomostethus luteiventris
leafvagrantTenthredinidaeDolerus madidus
leafvagrantTenthredinidaeDolerus ferrugatus
leafvagrantTenthredinidaeDolerus triplicatus
leafvagrantsummer generationAphididaeSitobion fragariae
fruitvagrantColeophoridaeColeophora caespititiella
fruitvagrantColeophoridaeColeophora glaucicolella
fruitvagrantColeophoridaeColeophora alticolella
flowergallPsyllidaeLivia junci
leafminerAgromyzidaeCerodontha luctuosa
leafpustuleuredinia teliaPuccinialesUromyces junci
stemborerAgromyzidaeCerodontha capitata
stemminerBuprestidaeAphanisticus emarginatus
rootgallPlasmodiophoralesLigniera junci
leafvagrantAphididaeCaricosipha paniculatae
leafvagrantAphididaeSipha glyceriae
leafvagrantAphididaeSitobion avenae


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.


Last modified 21.ix.2022