yellow thistle

organ parasitic mode stage note taxonomic group parasite
vagrant Aphididae Uroleucon macrosiphon
leaf vagrant summer generation Aphididae Aphis fabae fabae
flower borer Cecidomyiidae Macrolabis cirsii
flower gall Cecidomyiidae Jaapiella cirsiicola
flower gall Tephritidae Tephritis conura
flower gall Tephritidae Urophora congrua
flower gall Tephritidae Urophora stylata
leaf borer Tephritidae Xyphosia miliaria
leaf down Erysiphales Erysiphe mayorii var. mayorii
leaf down Erysiphales Golovinomyces montagnei
leaf down Peronosporales Bremia cirsii
leaf miner Anthomyiidae Pegomya steini
leaf miner Gelechiidae Gnorimoschema ochraceellum
leaf miner Gelechiidae Scrobipalpa acuminatella
leaf pustule aecia Pucciniales Puccinia dioicae
leaf pustule aecia uredinia telia Pucciniales Puccinia cirsii-eriophori
leaf pustule uredinia telia Pucciniales Puccinia laschii
leaf pustule telia Pucciniales Puccinia cnici-oleracei
leaf vagrant Triozidae Trioza cirsii
leaf vagrant summer generation Aphididae Aphis fabae cirsiiacanthoidis
leaf vagrant summer generation Aphididae Brachycaudus cardui

Organ

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.

PARASITIC MODE

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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IMPORTANT

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 31.i.2019