My butternut squash plants, although are growing very well, seem to have this white patterning along the veins of their leaves.
It looks a bit like powdery mildew, however all of the pictures I’ve seen of that online seem to be more spotty and less distributed like this. This patterning is seen across ALL of my squash plants and I’m not sure if I need to do something or just let it grow!
Does it actually wipe off?
It does not wipe off!
Then it looks like the initial spread of the virus before it starts producing all the junk that covers the leaves. There's lots of stuff you can do to combat it, just search around and doo all the things, because slowing it early is about the best outcome you can hope for.