Beans problems

Photo of the problem is available on alt.binaries.pictures.gardens.
As I was taking photos of my garden earlier today I've noticed a bit of dry wilting on two of the string bean plants. Thus far it does not appear to impact the actual bean pods but I'm concerned and wonder if it's something that I need to treat so that it doesn't spread to other plants? I've circled the problem areas.
Advice will be greatly appreciated.
-Mariana Monmouth County, NJ
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