Foodplant / spot causer
effuse or punctiform colony of Cladosporium dematiaceous anamorph of Mycosphaerella macrospora causes spots on fading leaf (especially end) of Iris sp. cult.

Foodplant / saprobe
becoming erumpent pycnidium of Phomopsis coelomycetous anamorph of Phomopsis iridis is saprobic on old, dead flowering shoot of Iris sp. cult.

Foodplant / parasite
hypophyllous telium of Puccinia iridis parasitises live leaf of Iris sp. cult.

Foodplant / pathogen
Bearded Iris Mosaic virus infects and damages live flower of Iris sp. (rhizomatous)
Remarks: season: early season

Foodplant / pathogen
Cucumber Mosaic virus infects and damages live Iris sp. (rhizomatous)

Foodplant / spot causer
effuse or punctiform colony of Cladosporium dematiaceous anamorph of Mycosphaerella macrospora causes spots on live leaf of Iris sp. (rhizomatous)

In Great Britain and/or Ireland:
Foodplant / saprobe
immersed pycnidium of Ascochyta coelomycetous anamorph of Ascochyta pseudacori is saprobic on dead leaf of Iris
Remarks: season: 12

Foodplant / sap sucker
Aulacorthum circumflexum sucks sap of live, distorted stem of Iris

Foodplant / parasite
often confluent sclerotium of Botrytis dematiaceous anamorph of Botryotinia convoluta parasitises live rhizome of Iris

Foodplant / pathogen
Ditylenchus destructor infects and damages longitudinally dark-streaked bulb scale of Iris

Foodplant / pathogen
Ditylenchus dipsaci infects and damages live leaf of Iris

Foodplant / sap sucker
Dysaphis tulipae sucks sap of live, stored tuber of Iris

Foodplant / pathogen
colony of Erwinia carotovora infects and damages corm of Iris

Foodplant / internal feeder
larva of Eumerus strigatus feeds within decaying rhizome of Iris

Foodplant / internal feeder
larva of Eumerus tuberculatus feeds within decaying rhizome of Iris

Foodplant / saprobe
apothecium of Hymenoscyphus robustior is saprobic on dead stem of Iris
Remarks: season: 6-7

Foodplant / pathogen
Iris Yellow Spot virus infects and damages Iris

Foodplant / saprobe
fruitbody of Lachnella villosa is saprobic on dead, decayed stem of Iris

Foodplant / sap sucker
Macrosiphum euphorbiae sucks sap of live shoot (young) of Iris

Foodplant / saprobe
becoming erumpent pycnidium of Phomopsis coelomycetous anamorph of Phomopsis iridis is saprobic on old, dead flowering shoot of Iris

Plant / resting place / on
adult of Plateumaris affinis may be found on flower of Iris
Remarks: season: 4-7(-9)

Foodplant / pathogen
Rosellinia necatrix infects and damages brown rotting, blackening corm of Iris
Other: major host/prey