dwarf thistle

synonym: Cirsium acaule

organ parasitic mode stage note taxonomic group parasite
flower borer larva Curculionidae Larinus turbinatus
flower gall Tephritidae Tephritis conura
flower borer Tephritidae Chaetostomella cylindrica
flower borer Tephritidae Terellia ruficauda
flower borer Tephritidae Terellia serratulae
flower gall Cecidomyiidae Jaapiella cirsiicola
leaf down Erysiphales Golovinomyces montagnei
leaf down Peronosporales Bremia cirsii
leaf miner Agromyzidae Liriomyza strigata
leaf miner Agromyzidae Phytomyza cirsii
leaf miner Agromyzidae Phytomyza spinaciae
leaf miner Anthomyiidae Pegomya steini
leaf miner Chrysomelidae Sphaeroderma testaceum
leaf miner Coleophoridae Coleophora peribenanderi
leaf miner Depressariidae Agonopterix subpropinquella
leaf miner Gelechiidae Scrobipalpa acuminatella
leaf miner Zygaenidae Jordanita globulariae
leaf miner Zygaenidae Jordanita notata
leaf pustule uredinia telia Pucciniales Puccinia laschii
leaf pustule telia Pucciniales Puccinia cnici-oleracei

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 1.vii.2019