Plant Parasites of Europe

leafminers, galls and fungi

Agrostis canina

velvet bent

organ parasitic mode stage note taxonomic group parasite
flower vagrant Miridae Lopus decolor
stem gall Chloropidae Oscinella nitidissima
stem borer Chloropidae Cetema elongatum
leaf vagrant Nymphalidae Coenonympha glycerion
leaf vagrant Delphacidae Delphacodes venosus
leaf vagrant Delphacidae Achorotile albosignata
leaf vagrant Delphacidae Xanthodelphax stramineus
stem scale Eriococcidae Greenisca glyceriae
root collar gall Anguinidae Anguina pacificae
leaf leaf spot incertae sedis Mastigosporium rubricosum
leaf vagrant Aphididae Sitobion avenae
flower gall Tilletiales Tilletia sphaerococca
leaf down Erysiphales Erysiphaceae Blumeria graminis
leaf leaf spot Georgefischeriales Jamesdicksonia dactylidis
leaf gall Anguinidae Anguina graminis
leaf miner Agromyzidae Agromyza nigripes
leaf miner Agromyzidae Cerodontha beigerae
leaf miner Elachistidae Elachista albifrontella
leaf pustule uredinia telia Pucciniales Puccinia agrostidis
leaf pustule uredinia telia Pucciniales Puccinia coronata
leaf pustule uredinia telia Pucciniales Puccinia graminis
leaf stripe Ustilaginales Ustilago striiformis
stem down Hypocreales Epichloe baconii
leaf vagrant Aphididae Sipha glyceriae
leaf vagrant Aphididae Schizaphis agrostis


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 1.iv.2022