Has my cucumber got powdery mildew?

[Lolapeg91]

Hello,
I have never had any issues growing cukes before but one of my cucumber plants has these white spots that I’ve never seen before.
is it powdery mildew or any other disease?

It’s on about 2-3 leaves and not on any new growth.

Pics attached
thanks

[ameno]

Yeah, that's powdery mildew.
Although to be precise, it's not all powdery mildew. On the leaf in the second picture there are a couple of spots with a beige outline to them. Those ones are not powdery mildew, but rather some sort of scorch marks (sun scorch, perhaps, or else where you got liquid feed on the leaves).

I would just remove the infected leaves. They are fine to compost (powdery mildew will not survive without a living host, so it will die even in a cool compost bin), but be sure to bury them in the pile so that the spores can't get out before they die and infect more leaves.