Steve, I have seen no difference in tolerance of fusarium wilt between potato leaf plants and regular leaf plants. Fusarium kills most of my plants every summer. Some varieties just seem to have more tolerance and take much longer to die. One thing that will assure rapid death from fusarium is if the symptoms show when the plant is still young. Immature plants seem to have little ability to withstand the disease while some older more mature plants can hang on and continue producing for months after the first symptoms appear.
I have never tried grafting of tomato plants.
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