organ parasitic mode stage note taxonomic group parasite
leaf vagrant Eriophyidae Aceria tosichella
leaf vagrant Eriophyidae Aculodes holcusi
fruit gall Tilletiales Tilletia caries
fruit gall Tilletiales Tilletia controversa
flower gall Ustilaginales Ustilago phrygica
flower gall Ustilaginales Ustilago tritici
leaf down Erysiphales Erysiphaceae Blumeria graminis
leaf miner Psychidae Apterona helicoidella
leaf pustule uredinia telia Pucciniales Puccinia clematidis-secalis
leaf pustule uredinia telia Pucciniales Puccinia graminis
leaf pustule uredinia telia Pucciniales Puccinia hordei-maritimi
leaf pustule uredinia telia Pucciniales Puccinia triticina
leaf pustule uredinia telia Pucciniales Puccinia aegilopis
leaf stripe uredinia telia Pucciniales Puccinia striiformis
stem gall Chloropidae Chlorops pumilionis
leaf vagrant Aphididae Sipha elegans
leaf vagrant Aphididae Sipha maydis
leaf vagrant Aphididae Sitobion avenae
leaf vagrant Aphididae Schizaphis phlei
leaf vagrant Aphididae Schizaphis rufula


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 8.x.2019