Plant Parasites of Europe

leafminers, galls and fungi

Allium cepa


organparasitic modestagenotetaxonomic groupparasite
systemicpustuleSclerotiniaceaeSclerotinia sclerotiorum
flowervagrantPyralidaeHypotia corticalis
leafvagrantMiridaeCampylomma diversicornis
leafvagrantMiridaeAdelphocoris lineolatus
leafvagrantPentatomidaeCarpocoris mediterraneus
scalePseudococcidaePhenacoccus emansor
stemborerNoctuidaeHydraecia micacea
flowervagrantNoctuidaeXylena exsoleta
leafvagrantNoctuidaeAutographa gamma
leafvagrantNoctuidaeAnarta trifolii
rootborerCossidaeDyspessa ulula
flowervagrantTortricidaeLobesia bicinctana
leafvagrantTetranychidaeBryobia graminum
leafvagrantChrysomelidaeLilioceris merdigera
rootborerBrachyceridaeBrachycerus plicatus
leafminerCurculionidaeOprohinus consputus
leafminerCurculionidaeOprohinus suturalis
leafvagrantsummer generationAphididaeMyzus persicae
leafvagrantTriozidaeBactericera tremblayi
leafvagrantTriozidaeBactericera kratochvili
leafvagrantAphididaeNeotoxoptera oliveri
leafvagrantAphididaeNeotoxoptera formosana
leafvagrantsummer generationAphididaeRhopalosiphum padi
leafvagrantsummer generationAphididaeAphis fabae
systemicborerAnguinidaeDitylenchus dipsaci
leafdownErysiphalesLeveillula allii
leafdownPeronosporalesPeronospora destructor
leafleaf spotCapnodialesCladosporium allii-cepae
leafleaf spotGlomerellalesColletotrichum circinans
leafminerAgromyzidaeLiriomyza cepae
leafminerAgromyzidaeLiriomyza huidobrensis
leafminerAgromyzidaeLiriomyza nietzkei
leafminerAgromyzidaePhytomyza gymnostoma
leafminerDrosophilidaeScaptomyza graminum
leafminerDrosophilidaeScaptomyza pallida
leafminerGlyphipterigidaeAcrolepiopsis assectella
leafpustuleaeciaPuccinialesMelampsora allii-fragilis
leafpustuleaeciaPuccinialesMelampsora allii-populina
leafpustuleaeciaPuccinialesPuccinia permixta
leafpustuleaeciaPuccinialesPuccinia sessilis
leafpustuleaecia uredinia teliaPuccinialesPuccinia allii
leafpustuleUrocystidalesUrocystis cepulae
leafpustuleUstilaginalesUstilago ceparum
leafvagrantEriophyidaeAceria tulipae
rootgallMeloidogynidaeMeloidogyne hapla
rootgallMeloidogynidaeMeloidogyne naasi
leafvagrantAphididaeMyzus ascalonicus


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 10.ix.2022