It looks like the early stage symptoms of fusarium wilt but lets hope not. I have dealt with it my whole lifetime of gardening and it can be frustrating. It will take down some plants fast and not even bother others sometimes. It can also be a slow acting killer with some varieties and they can hang on and produce for a long time despite the fusarium. If you have one stem that is particularly affected like that it sometimes helps to just cut that stem off right at the juncture to the main stem. I now graft all my heirlooms onto a fusarium resistant root stock because my soil is so infested with the stuff that few plants can survive long enough to produce ripe fruit except some of those tasteless super hybrids that provide those wonderful pink things they call tomatoes in the grocery store.
Bill
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