Plant Parasites of Europe

leafminers, galls and fungi

Juncus articulatus

jointed rush

synonym: Juncus aquaticus, bracteosus, geniculatus, lamprocarpus

organ parasitic mode stage note taxonomic group parasite
leaf vagrant Cicadellidae Planaphrodes nigritus
leaf vagrant Phlaeothripidae Haplothrips aculeatus
leaf leaf spot Phaeosphaeriaceae Phaeosphaeria petkovicensis
stem borer Noctuidae Coenobia rufa
leaf vagrant Nymphalidae Coenonympha tullia
leaf vagrant Cicadellidae Macrosteles sexnotatus
leaf vagrant Delphacidae Conomelus anceps
leaf vagrant Delphacidae Florodelphax leptosoma
leaf vagrant Cicadellidae Macrosteles horvathi
root borer Chrysomelidae Chaetocnema subcoerulea
root gall doubtful Entorrhizales Juncorrhiza casparyana
flower borer Kateretidae Kateretes rufilabris
leaf miner younger larva Tenthredinidae Eutomostethus luteiventris
leaf vagrant older larva Tenthredinidae Eutomostethus luteiventris
root collar borer Tortricidae Bactra lancealana
fruit vagrant Coleophoridae Coleophora tamesis
fruit vagrant main Coleophoridae Coleophora taeniipennella
fruit vagrant Coleophoridae Coleophora alticolella
fruit vagrant Coleophoridae Coleophora glaucicolella
fruit vagrant Coleophoridae Coleophora caespititiella
flower gall Psyllidae Livia junci
leaf miner Agromyzidae Cerodontha luctuosa
leaf miner Ephydridae Hydrellia nigricans
leaf pustule uredinia telia Pucciniales Uromyces junci
leaf stripe Urocystidales Urocystis tothii
stem miner Buprestidae Aphanisticus emarginatus
leaf vagrant doubtful Aphididae Atheroides hirtellus
leaf vagrant Aphididae Sipha glyceriae
leaf vagrant Aphididae Schizaphis palustris


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 30.xii.2023