Leaves curl up and go brown. If you catch it early, rip off the stems and pull the spuds, they should be OK. Shouldn't be a problem unless we get a lot of wet weather. All info from D.G. Hessayon's veg expert. I've never had the disease in my crop so I have no first hand knowledge as to what it looks like. I'm still learning after 36 years.

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If it ain't broke, don't fix it and if you ain't going to eat it, don't kill it