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Unhappy Grape
Hi,
Noticed my grape plant (2-3 years old) is suddenly developing a lot of these patterns on the leaves

Is this a disease that needs to be tackled? Thanks
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I think that may be a nutritional deficiency - what do you feed it and when?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I feed it generic outdoor plant feed every fortnight. Maybe i need something more specific?