I had better luck with some of my black tomato varieties with fusarium than most of the pinks and reds but I never found one that had what I would call true resistance. One problem you may be having with the black varieties is some gray mold. It will tend to show up first on the shadiest parts of the plant first so if the side that is looking sick is the shady side that may be your culprit. Even if it is it should move much slower up the plant in the low humidity of California than it does down here where the humidity is so high. Try a copper spray on your black tomatoes and see if it makes a difference.
Bill
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