organ parasitic mode stage note taxonomic group parasite
stem vagrant Ortheziidae Orthezia urticae
leaf hidden Tortricidae Aphelia paleana
leaf miner younger larva Tortricidae Cnephasia asseclana
leaf hidden older larva Tortricidae Cnephasia asseclana
leaf hidden Tortricidae Cnephasia incertana
leaf vagrant Tortricidae Aphelia viburniana
leaf vagrant Eriophyidae Cecidophyes geranii
flower borer Pterophoridae Amblyptilia punctidactyla
flower borer Pterophoridae Amblyptilia acanthadactyla
root collar borer larva Curculionidae Zacladus exiguus
fruit borer larva Curculionidae Zacladus geranii
root borer Sesiidae Pyropteron mannii
root gall rarely Sesiidae Pyropteron triannuliformis
root borer Sesiidae Pyropteron leucomelaena
root borer Sesiidae Synanthedon geranii
leaf leaf spot Capnodiales Ramularia geranii
leaf vagrant summer generation Aphididae Aphis nasturtii
leaf vagrant summer generation Aphididae Aphis fabae
systemic borer Anguinidae Ditylenchus dipsaci
fruit gall Cecidomyiidae Dasineura geranii
flower gall Curculionidae Limobius borealis
leaf down Erysiphales Erysiphe geraniacearum
leaf down Erysiphales Leveillula geraniacearum
leaf down Erysiphales Neoërysiphe geranii
leaf down Erysiphales Podosphaera fugax
leaf down Peronosporales Peronospora conglomerata
leaf down Peronosporales Plasmopara geranii-silvatici
leaf down Peronosporales Plasmopara praetermissa
leaf down Peronosporales Plasmopara pusilla
leaf down Peronosporales Plasmopara wilsonii
leaf leaf spot Entylomatales Entyloma atlanticum
leaf leaf spot Venturiales Coleroa circinans
leaf leaf spot Venturiales Coleroa robertiani
leaf gall Eriophyidae Aceria dissecti
leaf gall Eriophyidae Aceria dolichosoma
leaf gall Eriophyidae Aceria geranii
leaf gall Eriophyidae Epitrimerus geranii
leaf miner Agromyzidae Liriomyza strigata
leaf miner Agromyzidae Agromyza nigrescens
leaf miner Buprestidae Habroloma geranii
leaf miner Curculionidae Orthochaetes insignis
leaf miner Lycaenidae Aricia agestis
leaf miner rarely Nepticulidae Stigmella aurella
leaf miner Psychidae Apterona helicoidella
leaf miner Tenthredinidae Fenella minuta
leaf miner Tenthredinidae Fenella monilicornis
leaf miner Tortricidae Cnephasia ecullyana
leaf miner Tortricidae Cnephasia lineata
leaf pustule aecia Pucciniales Puccinia polygoni
leaf pustule aecia Pucciniales Puccinia polygoni-amphibii
leaf pustule aecia uredinia telia Pucciniales Uromyces geranii
leaf pustule aecia uredinia telia Pucciniales Uromyces kabatianus
leaf pustule aecia Pucciniales Aecidium tranzschelianum
leaf pustule uredinia telia Pucciniales Puccinia oerteliana
leaf pustule telia Pucciniales Puccinia flahaulti
leaf pustule telia Pucciniales Puccinia geranii-silvatici
leaf pustule telia Pucciniales Puccinia morthieri
leaf pustule telia doubtful Pucciniales Uromyces carpathicus
leaf vagrant Eriophyidae Epitrimerus femoralis
stem gall Asterolecaniidae Planchonia arabidis
root collar gall Actinomycetales Rhodococcus fascians
root collar gall doubtful Eriophyidae Aceria schlechtendali
root gall Meloidogynidae Meloidogyne hapla
leaf vagrant Aphididae Myzus ascalonicus
root collar vagrant doubtful Aphididae Maculolachnus submacula
unknown unknown Aphididae Prociphilus xylostei
unknown unknown Aphididae Prociphilus xylostei
leaf vagrant Eriophyidae Abacarus stadelbacheri
leaf vagrant Aphididae Aulacorthum solani
leaf vagrant Aphididae Acyrthosiphon malvae malvae
leaf vagrant summer generation Aphididae Myzus persicae
leaf vagrant Diptilomiopidae Quadracus geraniellus


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 23.ii.2020