Rose Mildew - Podosphaera pannosa

    Description

    A white, powdery fungal growth on the leaves and shoots. Upper, lower or both leaf surfaces can be affected. Mildew growth may also be found on the stems, flower stalks, calyces and petals. Mildew growth on stems (where it is often found surrounding thorns) and flower stalks is usually thicker and more mat-like than that on the leaves.

    Identification difficulty
    Habitat

    On Rosa species.

    When to see it

    Best time to see it is spring to autumn.

    Life History

    Rose mildew overwinters as fungal growth (mycelium) on the stems, or within some of the dormant buds. When these buds resume growth in spring the shoots soon become completely covered with mildew. The fungus then spreads from these infected shoots (known as ?primaries?) onto the rest of the plant.

    UK Status

    Common and widespread in Britain.

    VC55 Status

    Frequent in Leicestershire and Rutland.

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    Leicestershire & Rutland Map

    MAP KEY:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

    UK Map