Iris · Perennial
Iris leaf spot (Cladosporium iridis): Remove and dispose of all leaf debris at the end of the year to reduce overwintering spores.
Bacterial soft rot: Plant bearded iris rhizomes partially exposed on well-drained soil to prevent waterlogging.
Iris rust: Pick off lightly infected leaves as soon as they are seen to slow the spread of the disease.
Ink disease: Dispose of affected plants immediately and rest the soil from bulbous irises for several years.
Virus infection: Dispose of virus-affected plants if performance is impaired to prevent transmission to neighbours.