common couch

synonym: Agropyron, Agropyrum, Elymus, repens; Elytrigia maritimifolium

organ parasitic mode stage note taxonomic group parasite
leaf vagrant Eriophyidae Aculodes mckenziei
leaf vagrant Eriophyidae Abacarus longilobus
leaf vagrant Eriophyidae Aceria tosichella
fruit gall Hypocreales Claviceps purpurea
fruit gall Tilletiales Tilletia controversa
flower gall Eriophyidae Aceria cornuta
flower gall Ustilaginales Ustilago bullata
leaf bud gall Lonchaeidae Dasiops latifrons
leaf miner>borer Ochsenheimeriidae Ochsenheimeria vacculella
leaf down Erysiphales Erysiphaceae Blumeria graminis
leaf leaf spot Phyllachorales Phyllachora graminis
leaf film Ustilaginales Tranzscheliella hypodytes
leaf gall main Aphididae Diuraphis frequens
leaf gall Eriophyidae Abacarus hystrix
leaf gall Peronosporales Sclerophthora macrospora
leaf gall Tarsonemidae Steneotarsonemus canestrinii
leaf miner Agromyzidae Agromyza nigrociliata
leaf miner Agromyzidae Agromyza rondensis
leaf miner doubtful Agromyzidae Cerodontha calosoma
leaf miner Agromyzidae Cerodontha denticornis
leaf miner Agromyzidae Cerodontha flavocingulata
leaf miner Agromyzidae Cerodontha incisa
leaf miner main Agromyzidae Cerodontha lateralis
leaf miner Agromyzidae Cerodontha muscina
leaf miner Agromyzidae Cerodontha pygmaea
leaf miner Agromyzidae Cerodontha spencerae
leaf miner Agromyzidae Cerodontha superciliosa
leaf miner Agromyzidae Cerodontha zuskai
leaf miner Agromyzidae Liriomyza flaveola
leaf miner Agromyzidae Pseudonapomyza atra
leaf miner Elachistidae Elachista albifrontella
leaf miner Elachistidae Elachista argentella
leaf miner Elachistidae Elachista fasciola
leaf miner Elachistidae Elachista griseella
leaf miner Elachistidae Elachista littoricola
leaf miner Elachistidae Elachista maculicerusella
leaf miner Elachistidae Elachista pollinariella
leaf miner Elachistidae Elachista pullicomella
leaf pustule Cantharellales Ceratorhiza rhizodes
leaf pustule uredinia telia Pucciniales Puccinia agropyri
leaf pustule uredinia telia Pucciniales Puccinia agropyrina
leaf pustule uredinia telia Pucciniales Puccinia cerinthes-agropyrina
leaf pustule uredinia telia Pucciniales Puccinia clematidis-secalis
leaf pustule uredinia telia Pucciniales Puccinia coronata
leaf pustule uredinia telia Pucciniales Puccinia graminis
leaf pustule uredinia telia Pucciniales Puccinia persistens
leaf pustule Urocystidales Urocystis agropyri
leaf stripe Blastocladiales Physoderma graminis
leaf stripe Microbotryales Ustilentyloma brefeldii
leaf stripe Ustilaginales Ustilago serpens
leaf stripe Ustilaginales Ustilago striiformis
stem borer Eurytomidae Tetramesa cornuta
stem gall Cecidomyiidae Haplodiplosis marginata
stem gall Cecidomyiidae Hybolasioptera fasciata
stem gall Cecidomyiidae Lasioptera calamagrostidis
stem gall Cecidomyiidae Mayetiola baudysi
stem gall Cecidomyiidae Mayetiola destructor
stem gall Chloropidae Chlorops pumilionis
stem gall Chloropidae Oscinella frit
stem gall main Eurytomidae Tetramesa hordei
stem gall Eurytomidae Tetramesa hyalipennis
stem gall Eurytomidae Tetramesa linearis
stem unknown Eurytomidae Tetramesa cereipes
stem vagrant Aphididae Laingia psammae
root gall Anguinidae Subanguina radicicola
root vagrant summer generation Aphididae Anoecia vagans
root vagrant summer generation Aphididae Forda marginata
inquiline Eriophyidae Aculodes dubius
leaf vagrant Aphididae Chaetosiphella berlesei
leaf vagrant Aphididae Sipha glyceriae
leaf vagrant Aphididae Sipha arenarii
leaf vagrant main Aphididae Sipha elegans
leaf vagrant Aphididae Sipha maydis
leaf vagrant summer generation Aphididae Rhopalosiphum padi
stem vagrant Aphididae Laingia psammae
leaf vagrant Aphididae Sitobion avenae
root vagrant doubtful Aphididae Forda pawlowae
root vagrant summer generation Aphididae Anoecia furcata


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.


mod 2.x.2019