Rose Rust - Phragmidium mucronatum

See description under Life History

On roses.

See Life History

In spring bright orange pustules appear on the leafstalks, branches, leaf underside and any remaining hips. During summer yellow-orange pustules then develop on the undersides of leaves, becoming interspersed with black pustules in late summer/early autumn. It usually overwinters in the form of teliospores associated with fallen leaves.

Widespread and common in Britain.

Quite common in Leicestershire and Rutland.