u/Colly_Mac — reddlx

Grateful some advice on what's ailing my lovely grape vine. I've put the photos into Google lens and it's suggested powdery mildew...

But I'm not convinced that's right (I think this looks really quite different to photos of powdery mildew affected vines online) and would really appreciate some advice.

What do you think this is? And how would you treat it?

The photos show:

Strongly affected leaf underside
Discolouration on the leaf topside
A healthier, but still affected leaf on the same vine

I think I'm going to try cutting off the worse affected to limit spread... But there aren't any fully healthy leaves 😬😭 really hoping it's not too far gone to save.