Plant Parasites of Europe

leafminers, galls and fungi

genus Dahlia

organparasitic modestagenotetaxonomic groupparasite
leafvagrantadultCurculionidaeOtiorhynchus apenninus
stemscaleMargarodidaeIcerya purchasi
scalePseudococcidaePhenacocccus gossypii
scaleCoccidaePulvinaria psidii
scaleDiaspididaeChrysomphalus aonidum
leafvagrantCicadellidaeEupteryx aurata
leafvagrantCicadellidaeEmpoasca decedens
leafvagrantCicadellidaeEupteryx atropunctata
leafleaf spotPleosporalesAscochyta dahliicola
flowerhiddenThripidaeFrankliniella intonsa
leafdownErysiphalesGolovinomyces tabaci
leafminerAgromyzidaeChromatomyia horticola
leafvagrantsummer generationAphididaeBrachycaudus helichrysi
leafvagrantAphididaeAphis gossypii
leafvagrantsummer generationAphididaeAphis fabae fabae
leafdownErysiphalesGolovinomyces orontii
leafdownErysiphalesGolovinomyces spadiceus
leafdownErysiphalesNeoërysiphe cumminsiana
leafleaf spotEntylomatalesEntyloma dahliae
leafleaf spotPleosporalesAlternaria carolinaeana
leafgallAphelenchoididaeAphelenchoides fragariae
leafminerAgromyzidaeChromatomyia syngenesiae
leafminerAgromyzidaeLiriomyza bryoniae
leafminerAgromyzidaeLiriomyza strigata
leafminerAgromyzidaeLiriomyza trifolii
leafvagrantsummer generationAphididaeAphis fabae
stemgallRhizobialesAgrobacterium tumefaciens
root collargallActinomycetalesRhodococcus fascians
rootborerAnguinidaeDitylenchus destructor
rootgallMeloidogynidaeMeloidogyne hapla
leafvagrantAphididaeMacrosiphum euphorbiae
leafvagrantAphididaeAulacorthum solani


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 19.xii.2021