Plant Parasites of Europe

leafminers, galls and fungi

Petasites hybridus


synonym: Petasites officinalis

organ parasitic mode stage note taxonomic group parasite
leaf vagrant Tenthredinidae Aglaostigma lichtwardti
leaf vagrant Tenthredinidae Aglaostigma discolor
leaf vagrant Tenthredinidae Tenthredo trabeata
leaf vagrant Tenthredinidae Tenthredo mandibularis
stem borer younger larva Depressariidae Agonopterix petasitis
leaf hidden older larva Depressariidae Agonopterix petasitis
root borer Tortricidae Epiblema grandaevana
leaf hidden Tortricidae Clepsis spectrana
leaf hidden Tortricidae Pandemis dumetana
root collar borer Tortricidae Epiblema turbidana
leaf miner summer generation Pterophoridae Platyptilia gonodactyla
stem borer spring generation Pterophoridae Platyptilia gonodactyla
stem borer Pterophoridae Buszkoiana capnodactylus
flower borer Syrphidae Cheilosia canicularis
stem borer Syrphidae Cheilosia orthotricha
leaf borer Syrphidae Cheilosia himantopus
leaf vagrant Aphididae Aphis torquens
flower borer Noctuidae Hydraecia petasitis
leaf borer Noctuidae Hydraecia petasitis
root borer Noctuidae Hydraecia petasitis
leaf down Erysiphales Golovinomyces cichoracearum
leaf miner Agromyzidae Phytomyza farfarae
leaf miner Agromyzidae Phytomyza tussilaginis
leaf miner Gelechiidae Scrobipalpula tussilaginis
leaf miner Tephritidae Acidia cognata
leaf miner Tephritidae Stemonocera cornuta
leaf miner Tephritidae Trypeta zoe
leaf pustule aecia Pucciniales Puccinia kummeri
leaf pustule aecia Pucciniales Puccinia petasites-melicae
leaf pustule aecia Pucciniales Puccinia petasites-poarum
leaf pustule aecia Pucciniales Puccinia petasites-pulchellae
leaf pustule aecia Pucciniales Puccinia ruttneri
leaf pustule aecia Pucciniales Puccinia taminensis
leaf pustule uredinia telia Pucciniales Coleosporium petasitis
leaf vagrant summer generation Aphididae Capitophorus similis
root collar vagrant summer generation Aphididae Anuraphis farfarae


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 23.iv.2020