I never had a case of fusarium on a grafted plant from my saved seeds. I did try to save seed from fruits taken off plants that were not showing any of the early signs of fusarium. I also got fusarium with any new varieties I tried before I started grafting onto FFF tolerant root stock. I always ferment my seeds and just before drying them I swish them around in a diluted bleach solution then rinse them and let them dry. I am assuming that if the fusarium was passed on in the seeds I saved it would show up on the grafted plants. But you know what they say about assuming.
Bill
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