Rose powdery mildew - Podosphaera pannosa

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How to recognise it
Patches of a powdery, off-white substance appear on the upper (and sometimes lower) surfaces of leaves and can merge to cover the entire leaf surface. Similar fungal growth may also be found on stems, buds and, occasionally, flowers. The leaves may turn yellow or purple and eventually curl, wither and fall prematurely. Affected buds may fail to open. The fungal growth on the stems may become thicker, particularly around the flower sepals and around the prickles. The mildew may turn a brown colour as it ages.

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