Rose Mildew - Podosphaera pannosa
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.
On Rosa species.
Best time to see it is spring to autumn.
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.
Common and widespread in Britain.
Frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015