Look similar to what mine did to some extent last year, but almost all were hit hard with it this year--yellow to brown on the leaves up and down the whole plant, top wilting and eventually dying, and stems turning brown. I've decided, after a lot of Internet searching, that it's most likely Verticulum Wilt.
In past years I had a bigger problem with bright yellow leaves initially up only one side of the plant (or sometimes affecting just one stem) and the tell-tale brown stem interior of Fusarium before the whole plant went belly up.
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