Rose rust
Phragmidium mucronatum
This description was machine-translated.
How to spot it
Rose rust is a fungal disease caused by Phragmidium mucronatum that occurs above all on roses, climbing roses and apple roses. It is characterised by orange yellow, powdery spore pustules on the upper leaf surface and cushion shaped rust brown pustules underneath. In late summer the spore pustules often turn dark brown to black. Where the attack is severe the leaves turn yellow and drop early, which weakens the plant.
Prevention
Choose tough, rust resistant rose varieties and plant them with enough spacing so that the leaves can dry off quickly after rain. Water at the base rather than over the foliage and pick a sunny, airy position. Collect infected leaves thoroughly in autumn and dispose of them with the household waste rather than on the compost, so that the spores cannot spread again. A balanced nutrient supply with moderate nitrogen also strengthens the plant's resilience.
Affected plants
These plants in our database are especially susceptible.
Not sure what is wrong with your plant?
Take a photo and let the AI diagnosis identify diseases and pests.
Start photo diagnosis