St John's Wort

In Great Britain and/or Ireland:
Foodplant / spinner
larva (later) of Calybites auroguttella spins live leaf of Hypericum perforatum
Remarks: season: summer & early autumn
Other: major host/prey

Foodplant / open feeder
imago of Chrysolina brunsvicensis grazes on leaf of Hypericum perforatum
Remarks: season: 1-12
Other: major host/prey

Foodplant / open feeder
adult of Chrysolina hyperici grazes on flower of Hypericum perforatum
Remarks: season: early 6-2
Other: major host/prey

Foodplant / open feeder
nocturnal adult of Chrysolina varians grazes on live leaf of Hypericum perforatum
Remarks: season: 6-10,3-

Foodplant / open feeder
adult of Cryptocephalus moraei grazes on live flower of Hypericum perforatum
Remarks: season: 5-9
Other: major host/prey

Foodplant / parasite
cleistothecium of Erysiphe hyperici parasitises Hypericum perforatum

Foodplant / saprobe
subepidermal pseudothecium of Keissleriella ocellata is saprobic on patchily blackened, dead stem of Hypericum perforatum

Foodplant / parasite
hypophyllous, caeomoid aecium of Melampsora hypericorum parasitises live leaf of Hypericum perforatum
Remarks: season: 5-10

Foodplant / saprobe
scattered to subgregarious, in irregular rows, long covered pycnidium of Phomopsis coelomycetous anamorph of Phomopsis hyperici is saprobic on dead stem of Hypericum perforatum
Remarks: season: 7-9

Foodplant / sap sucker
Rhopalus subrufus sucks sap of Hypericum perforatum
Other: major host/prey

Foodplant / saprobe
acervulus of Seimatosporium coelomycetous anamorph of Seimatosporium hypericinum is saprobic on dead stem of Hypericum perforatum

Foodplant / spot causer
mainly epiphyllous, brown pycnidium of Septoria coelomycetous anamorph of Septoria hyperici causes spots on fading leaf of Hypericum perforatum
Remarks: season: 8-10

Foodplant / open feeder
nocturnal larva of Tenthredo amoena grazes on leaf of Hypericum perforatum
Other: sole host/prey

Foodplant / open feeder
nocturnal larva of Tenthredo balteata grazes on leaf of Hypericum perforatum