Thank you both. I went ahead and snipped them yesterday.
Another question: what do you do when you do get wilt? One of my cucumbers has it already, and it's just started flowering. I never found a single beetle near them, but that made me even more sure they'd been there at some point. I was right, apparently.
I found a few (very few) at the base of my squash and dispatched them, and two leaf-footed bugs--got rid of those, too. But apparently there are more than I'm finding. I've found them in the soil around the base of the plant, never on the leaves, never any eggs anywhere, either. Where do you usually find them?
And what happens to the sick one now? Do I snip it now or just cut off the parts I can see are affected?