Marsh Thistle

Foodplant / parasite
effuse colony of Botryosporium anamorph of Botryosporium pulchrum parasitises live Cirsium palustre
Other: minor host/prey

In Great Britain and/or Ireland:
Foodplant / parasite
sporangium of Bremia lactucae parasitises live Cirsium palustre
Other: unusual host/prey

Foodplant / internal feeder
larva of Chaetostomella cylindrica feeds within capitulum of Cirsium palustre

Plant / associate
larva (mature) of Cheilosia albipila is associated with root of Cirsium palustre
Remarks: season: late 6-7
Other: unusual host/prey

Foodplant / internal feeder
larva of Cheilosia fraterna feeds within side branch of Cirsium palustre

Foodplant / internal feeder
larva of Cheilosia grossa feeds within root (after stem) of multi-stemmed plant of Cirsium palustre
Remarks: season: 6-7

Foodplant / internal feeder
larva of Cheilosia proxima feeds within side branch of Cirsium palustre

Foodplant / parasite
Erysiphe mayorii parasitises Cirsium palustre

Foodplant / parasite
Golovinomyces cichoracearum parasitises live Cirsium palustre

Foodplant / open feeder
adult of Lema cyanella grazes on leaf of Cirsium palustre
Remarks: season: 1-12

Foodplant / saprobe
numerous, scattered to gregarious, almost superficial, brown-black pycnidium of Rhabdospora coelomycetous anamorph of Ophiobolus cirsii is saprobic on dead stem of Cirsium palustre
Remarks: season: 2-5

Foodplant / miner
larva of Phytomyza albiceps mines leaf of Cirsium palustre
Other: minor host/prey

Plant / resting place / within
puparium of Phytomyza autumnalis may be found in leaf-mine of Cirsium palustre

Plant / resting place / on
puparium of Phytomyza cirsii may be found on leaf of Cirsium palustre
Other: major host/prey

Foodplant / saprobe
subsessile apothecium of Psilachnum rubrotinctum is saprobic on dead stem of Cirsium palustre
Remarks: season: 6

Foodplant / parasite
mostly hypophyllous telium of Puccinia calcitrapae parasitises live leaf of Cirsium palustre
Other: minor host/prey

Foodplant / parasite
amphigenous telium of Puccinia cnici-oleracei parasitises live leaf of Cirsium palustre
Remarks: season: 7-11
Other: major host/prey

Foodplant / parasite
pycnium of Puccinia dioicae var. dioicae parasitises live Cirsium palustre

Foodplant / saprobe
erumpent apothecium of Pyrenopeziza adenostylidis is saprobic on dead stem of Cirsium palustre
Remarks: season: 5-11

Foodplant / saprobe
erumpent apothecium of Pyrenopeziza carduorum is saprobic on dead stem of Cirsium palustre
Remarks: season: 5-8

Foodplant / spot causer
amphigenous colony of Ramularia hyphomycetous anamorph of Ramularia cynarae causes spots on live leaf of Cirsium palustre

Foodplant / sap sucker
Rhopalus maculatus sucks sap of Cirsium palustre
Other: minor host/prey

Foodplant / internal feeder
larva of Tephritis conura feeds within capitulum of Cirsium palustre

Foodplant / feeds on
larva of Terellia ruficauda feeds on Cirsium palustre

Foodplant / internal feeder
larva of Terellia winthemi feeds within capitulum of Cirsium palustre

Foodplant / sap sucker
nymph of Tingis cardui sucks sap of involucre of Cirsium palustre
Remarks: season: 7-10

Foodplant / saprobe
sessile apothecium of Unguicularia incarnatina is saprobic on dead stem of Cirsium palustre
Remarks: season: 4-11

Foodplant / feeds on
larva of Urophora stylata feeds on Cirsium palustre

Foodplant / internal feeder
larva of Xyphosia miliaria feeds within capitulum of Cirsium palustre