Knapweed

Foodplant / gall
Aceria centaurea causes gall of leaf of Centaurea

In Great Britain and/or Ireland:
Foodplant / nest
female of Andrena hattorfiana provisions nest with pollen of Centaurea
Other: minor host/prey

Foodplant / internal feeder
larva of Apion armatum feeds within stem? of Centaurea

Foodplant / internal feeder
larva of Apion onopordi feeds within stem of Centaurea

Foodplant / parasite
sporangium of Bremia lactucae parasitises live leaf of Centaurea
Remarks: season: 9-10
Other: unusual host/prey

Foodplant / open feeder
larva of Cassida vibex grazes on leaf of Centaurea

Plant / resting place / on
adult of Chrysolina marginata may be found on Centaurea
Remarks: season: early 8-mid 11,4-

Foodplant / sap sucker
Dactynotus jaceae sucks sap of stem of Centaurea
Remarks: season: 6-9

Foodplant / saprobe
apothecium of Hyalopeziza millepunctata is saprobic on dead stem of Centaurea
Remarks: season: 10-6

Foodplant / gall
larva of Isocolus fitchi causes gall of leaf (midrib) of Centaurea

Foodplant / gall
larva of Isocolus jaceae causes gall of inflorescence of Centaurea

Foodplant / gall
larva of Isocolus rogenhoferi causes gall of inflorescence of Centaurea

Foodplant / gall
larva of Isocolus scabiosae causes gall of root of Centaurea

Foodplant / saprobe
immersed pseudothecium of Kalmusia clivensis is saprobic on dead stem of Centaurea
Remarks: season: 5-6

Foodplant / internal feeder
larva of Larinus planus feeds within capitulum of Centaurea
Remarks: Other: uncertain

Foodplant / saprobe
erumpent pseudothecium of Leptosphaeria doliolum is saprobic on dead stem of Centaurea
Remarks: season: 1-12

Foodplant / miner
larva of Liriomyza strigata mines leaf of Centaurea

Foodplant / gall
larva of Loewiola centaureae causes gall of leaf (vein) of Centaurea

Foodplant / saprobe
immersed or semi-immersed pseudothecium of Lophiostoma caulium is saprobic on dead stem of Centaurea
Remarks: season: 1-12

Foodplant / saprobe
mostly immersed, becoming partly erumpent to free pseudothecium of Lophiostoma semiliberum is saprobic on dead stem of Centaurea
Remarks: season: 12-4
Other: minor host/prey

Foodplant / saprobe
usually immersed pseudothecium of Lophiostoma vagabundum is saprobic on dead stem of Centaurea
Remarks: season: 1-12
Other: major host/prey

Foodplant / gall
larva of Phanacis centaureae causes gall of stem of Centaurea

Foodplant / saprobe
gregarious or scattered, erumpent apothecium of Pirottaea inopinata is saprobic on dead stem of Centaurea
Remarks: season: 4

Foodplant / saprobe
apothecium of Pyrenopeziza revincta is saprobic on dead stem of Centaurea

Foodplant / feeds on
Selenophoma coelomycetous anamorph of Selenophoma moravica feeds on Centaurea

Foodplant / open feeder
larva of Sphaeroderma testaceum grazes on Centaurea

Foodplant / feeds on
Tanymecus palliatus feeds on Centaurea
Other: major host/prey

Foodplant / internal feeder
larva of Trupanea amoena feeds within capitulum of Centaurea

Foodplant / saprobe
sessile apothecium of Unguicularia incarnatina is saprobic on dead stem of Centaurea
Remarks: season: 4-7

Foodplant / gall
larva of Urophora cuspidata causes gall of capitulum of Centaurea

Foodplant / gall
larva of Urophora jaceana causes gall of capitulum of Centaurea

Foodplant / gall
larva of Urophora quadrifasciata causes gall of capitulum of Centaurea