Iris Rust - Puccinia iridis
The rust fungus Puccinia iridis affects both surfaces of the leaves of various types of the primary host, Iris, producing brown uredinia and blackish telia. These are not listed as gall-causers in Redfern & Shirley (2023)
The alternate host, producing white aecia and spermogonia, is either Valeriana (Valerian) or Urtica (nettle); it is not gall-causing on these hosts.
host 
Photograph the rust on the host. Ensure you have noted the host-plant species in your comments
On Iris leaves, frequently recorded on Stinking iris (I foetidissima); also Yellow Flag-iris (I pseudoacorus) and Bearded Iris in gardens (I x germanica); may be present in VC55 on other species.
Peter Smith
Cropston garden
30 June 2018
on Bearded Iris
Melinda Bell
Coalville, Donington le Heath Manor
23 May 2021
on Stinking Iris
Peter Smith
Cropston garden
30 June 2018
Melinda Bell
Breedon,Doctor's Lane
23 June 2023
on Stinking Iris
Peter Smith
Cropston garden
30 June 2018
on Bearded Iris
Peter Smith
Cropston garden
30 June 2018
Peter Smith
Leicester, Castle Park
16 December 2022
on Stinking Iris
Melinda Bell
Appleby Magna,Old School House
17 November 2020
Dylan
Melton Kirby Lane
24 September 2024
Upper side of leaf
Melinda Bell
Lockington,St Nicholas Church
23 November 2023
Dylan
Melton Kirby Lane
14 January 2026
Upper side of leaf
Melinda Bell
Oakham Cemetery
05 October 2024
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Species profile
- Common names
- Iris Rust
- Species group:
- fungus
- Kingdom:
- Fungi
- Order:
- Pucciniales
- Family:
- Pucciniaceae
- Records on NatureSpot:
- 17
- First record:
- 30/06/2018 (Smith, Peter)
- Last record:
- 14/01/2026 (Pugh, Dylan)
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