I have a bunch of string beans that were up a couple of weeks ago, and they
are suddenly looking like they froze. It got down into the low thirties,
but nothing else froze, including the tomatoes and peppers. Many of the
leaves are turning brown to blackish, and curling up or going limp.

Do I have some kind of a blight? If so, what can I do about it now, and how
can I avoid it later?

If it's not a blight, what might it be and what do I do?

Thank you in advance.

Lightnin Dave