Willowherb Rust - puccinia pulverulenta

    Description

    Willowherb rust is a disease caused by the fungus, Puccinia pulverulenta. Initially, pale, ill defined yellow spots appear on the upper leaf surface, corresponding to orange, dusty pustules on the lower surface.

    Habitat

    Where willowherbs are plentiful.

    When to see it

    Summer

    Life History

    The fungus releases orange spores from the pustules and these are spread by the wind to initiate new infections on leaves.

    UK Status

    Widespread and fairly frequent in Britain.

    VC55 Status

    Thought to be fairly frequent in Leicestershire and Rutland.

    Leicestershire & Rutland Map

    UK Map