synonym: Carduus viridis

organ parasitic mode stage note taxonomic group parasite
stem borer larva Curculionidae Hadroplontus litura
vagrant Aphididae Uroleucon macrosiphon
flower borer Tephritidae Tephritis hyoscyami
flower borer Tephritidae Terellia serratulae
flower borer Tephritidae Terellia winthemi
flower gall Microbotryales Microbotryum cardui
flower gall Tephritidae Tephritis conura
flower gall Tephritidae Urophora solstitialis
leaf borer Tephritidae Xyphosia miliaria
leaf down Erysiphales Golovinomyces montagnei
leaf down Peronosporales Bremia lactucae
leaf gall Aphididae Aphis wartenbergi
leaf miner Agromyzidae Phytomyza cirsii
leaf miner Anthomyiidae Pegomya hessei
leaf miner Anthomyiidae Pegomya steini
leaf miner Depressariidae Agonopterix carduella
leaf miner Gelechiidae Scrobipalpa acuminatella
leaf pustule aecia Pucciniales Aecidium cardui
leaf pustule uredinia telia Pucciniales Puccinia carduorum
leaf vagrant summer generation Aphididae Brachycaudus cardui
leaf vagrant summer generation Aphididae Aphis fabae
leaf vagrant summer generation Aphididae Aphis fabae cirsiiacanthoidis
stem vagrant Aphididae Uroleucon aeneum


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.