Plant Parasites of Europe

leafminers, galls and fungi

genus Polemonium

organ parasitic mode stage note taxonomic group parasite
flower borer Pterophoridae Amblyptilia punctidactyla
leaf leaf spot Didymellaceae Ascochyta polemonii
leaf leaf spot Phyllostictaceae Phyllosticta polemonii
leaf leaf spot Mycosphaerellaceae Septoria polemonii
leaf miner younger larva Tortricidae Cnephasia asseclana
leaf hidden older larva Tortricidae Cnephasia asseclana
fruit borer Agromyzidae Liriomyza ivanauskasi
stem borer Agromyzidae Melanagromyza polemonii
leaf down Erysiphales Golovinomyces magnicellulatus
leaf down Erysiphales Podosphaera polemonii
leaf down Erysiphales Podosphaera xanthii
leaf leaf spot Entylomatales Entyloma lapponicum
leaf miner Agromyzidae Liriomyza aterrima
leaf miner Agromyzidae Liriomyza bryoniae
leaf miner Agromyzidae Liriomyza strigata
leaf miner Agromyzidae Liriomyza xanthocera
leaf pustule telia Pucciniales Puccinia polemonii
leaf vagrant Eriophyidae Tegonotus septentrionalis


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 31.i.2023