In Great Britain and/or Ireland:
Foodplant / spot causer
pycnidium of Ascochyta coelomycetous anamorph of Ascochyta armoraciae causes spots on live leaf of Armoracia rusticana
Remarks: season: 7-10
Foodplant / open feeder
gregarious larva of Athalia rosae grazes on leaf (underside) of Armoracia rusticana
Other: major host/prey
Foodplant / spot causer
Cercospora dematiaceous anamorph of Cercospora armoraciae causes spots on live leaf of Armoracia rusticana
Remarks: season: 9-10
Foodplant / saprobe
colony of Dendryphion dematiaceous anamorph of Dendryphion comosum is saprobic on dead Armoracia rusticana
Remarks: season: 1-12
Foodplant / parasite
Erysiphe cruciferarum parasitises live Armoracia rusticana
Foodplant / sap sucker
adult of Eurydema oleracea sucks sap of Armoracia rusticana
Foodplant / saprobe
superficial, scattered on in small groups, thinly subiculate perithecium of Hydropisphaera arenula is saprobic on dead stem of Armoracia rusticana
Remarks: season: 1-12
Foodplant / pathogen
Leptosphaeria maculans infects and damages live Armoracia rusticana
Foodplant / parasite
colony of sporangium of Peronospora parasitica parasitises live Armoracia rusticana
Foodplant / open feeder
larva of Phaedon cochleariae grazes on live leaf of Armoracia rusticana
Remarks: season: -early 9
Foodplant / shot hole causer
amphigenous colony of Ramularia hyphomycetous anamorph of Ramularia armoraciae causes shot holes on live leaf of Armoracia rusticana
Remarks: season: 7-10
Other: major host/prey
Foodplant / spot causer
punctiform, pallid, central pycnidium of Septoria coelomycetous anamorph of Septoria armoraciae causes spots on live leaf of Armoracia rusticana
Remarks: season: 7-10
Foodplant / pathogen
colony of Thielaviopsis dematiaceous anamorph of Thielaviopsis basicola infects and damages Armoracia rusticana
Foodplant / saprobe
effuse colony of Torula dematiaceous anamorph of Torula herbarum is saprobic on dead Armoracia rusticana
Foodplant / pathogen
Turnip Mosaic virus infects and damages live, stunted leaf of Armoracia rusticana
Remarks: season: Summer