The vine leaves in my son's greenhouse have white marks (see picture). He and his wife are worried it is blight. I know nothing about vines but I do recognise blight on tomatoes and potatoes. This is more like the whitish mould I get on courgette leaves. The leaves do not appear to be suffering and the marks were spotted well over a week ago. Any ideas what it is and what should be done if anything?
Anton
Anton
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