I'm growing four kinds of bush beans in containers. Overnight, two of them, Provider and Tenderpod, seem to have been hit by a disease (or something else?).

A healthy plant with a very unhealthy one next to it:

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In another container, a leaf getting progressively worse:

{{gwi:1026614}}

So far, at least, Royal Burgundy and Black Valentine appear to be unaffected.

Any idea what the problem is, and what I can do about it?

Thanks!