Plant Parasites of Europe

leafminers, galls and fungi

Ulmus americana

organ parasitic mode stage note taxonomic group parasite
stem scale Diaspididae Diaspidiotus gigas
unknown scale Diaspididae Diaspidiotus marani
stem scale Diaspididae Diaspidiotus zonatus
stem borer Curculionidae Scolytus scolytus
stem vagrant Eriococcidae Gossyparia spuria
leaf gall spring generation rarely Aphididae Tetraneura ulmi
leaf vagrant Aphididae Tinocallis takachihoensis
leaf gall spring generation Aphididae Colopha compressa
leaf gall spring generation Aphididae Eriosoma grossulariae
leaf gall spring generation Aphididae Eriosoma ulmi
leaf gall spring generation Aphididae Eriosoma lanigerum
leaf miner Tenthredinidae Fenusa ulmi
leaf vagrant rarely Aphididae Tinocallis platani


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.


To filter the table above, add a text to the search field (top right of the table).
To sort a column click on an arrow after the column name (both ascending and descending).
Sort multiple columns with Shift + click on the arrows.


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 18.v.2023