I hate to break it to you but that is fusarium wilt. I have been battling it for over 40 years and it is so common here especially hitting the non hybrid varieties that don't have any or very little resistance. I graft all of my plants usually but this year I planted 23 along a fence that weren't grafted and so far all but five have the symptoms and I have already pulled six because they totally wilted. Hopefully it isn't too bad and your plant can continue to produce for a while.
Bill
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