Plant Parasites of Europe

leafminers, galls and fungi

Geranium robertianum


organ parasitic mode stage note taxonomic group parasite
leaf leaf spot Phyllostictaceae Phyllosticta pivensis
leaf leaf spot Mycosphaerellaceae Septoria geranii
leaf vagrant rarely Pentatomidae Eysarcoris venustissimus
leaf vagrant Rhopalidae Rhopalus subrufus
predator Miridae Dicyphus epilobii
predator Miridae Dicyphus errans
predator Miridae Dicyphus flavoviridis
leaf hidden Tortricidae Archips rosana
leaf miner Zygaenidae Adscita geryon
leaf vagrant doubtful Lycaenidae Cacyreus marshalli
leaf vagrant Cicadellidae Ophiola decumana
leaf vagrant Cicadellidae Hauptidia distinguenda
leaf vagrant Cicadellidae Hauptidia provincialis
flower hidden Thripidae Taeniothrips picipes
root vagrant Chrysomelidae Aphthona pallida
root vagrant Chrysomelidae Aphthona nigriceps
leaf vagrant Tenthredinidae Ametastegia carpini
flower borer Pterophoridae Amblyptilia acanthadactyla
fruit borer larva Curculionidae Zacladus geranii
root collar borer larva Curculionidae Zacladus exiguus
leaf leaf spot Capnodiales Ramularia geranii
root collar vagrant Aphididae Maculolachnus submacula
leaf vagrant summer generation Aphididae Aphis nasturtii
leaf down Erysiphales Erysiphe geraniacearum
leaf down Erysiphales Podosphaera fugax
leaf down Peronosporales Peronospora conglomerata
leaf leaf spot Venturiales Coleroa robertiani
leaf gall Eriophyidae Aceria geranii
leaf gall Eriophyidae Epitrimerus geranii
leaf miner Agromyzidae Agromyza nigrescens
leaf pustule aecia uredinia telia Pucciniales Uromyces geranii
leaf vagrant Aphididae Acyrthosiphon malvae malvae
leaf vagrant Eriophyidae Epitrimerus femoralis
stem gall Asterolecaniidae Planchonia arabidis


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 20.ix.2022