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I have three Thompson seedless vines that, although produce well, I lose most of the crop to black rot. I've used sulfur, but that doesn't seem to be very effective. I don't want to use other fungicides. I'm considering pulling the vines. Two questions: Are there good producing table grape varieties that are very resistant or immune to black rot? What would my chances of success be if I grafted a resistant variety onto the existing Thompson rootstock. The current vines are 4 years old.
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