I think your problem may be gray mold. I had it a couple of years ago in my bush beans when we had a lot of rain. Since then I have gone ahead and sprayed my beans with a copper fungicide whenever I am spraying my tomatoes and I also spray them with the dilute bleach spray whenever I see early symptoms of gray mold. Maybe it is something else but I would give it a try. You might also want to start using a liquid fertilizer like Texas Tomato Food every few weeks since your soil is even more sandy than mine. I have found it increases production greatly.
I have had the most success with fall beans using Maxibel.
Bill
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