Rosa rugosa · Shrub
Rose rust: Prune out infected growth immediately and collect fallen leaves in autumn to reduce overwintering spores.
Rose black spot: Improve air circulation, remove affected foliage, and avoid wetting the leaves when watering.
Powdery mildew: Ensure good air circulation and prune out affected growth; avoid overhead watering to keep foliage dry.
Rose dieback: Prune affected wood back to healthy tissue at an angle and disinfect tools between cuts.
Aphids: Encourage natural predators like ladybirds or blast off infestations with a strong jet of water.