potato leaves issue

[emmav6]

just wondered if anyone knows what this is on my potato leaves. They are red duke of york first earlies planted about 10-12 weeks ago. plants look fine otherwise & row of maincrop next to them not affected



thanks
emma

[Potstubsdustbins]

At 12 weeks they should be ready for lifting, looks to me as if the leaves are starting to die back naturally.

[emmav6]

that's a relief, hoping to dig them up next week thank-you for your help