I think Bill is basically right. If it isn't limited to the soil, the rootstock won't be able to keep it away and I can't see how a rootstock would be able to convey any other type of resistance to the scion.
But I do find that grafting does provide some help in overcoming foliar issues. Basically a well fed grafted plant can put on new growth faster and stays a bit stronger so if I'm taking off diseases lower leaves, for instance, it has a better chance of powering on and producing. Similarly, a healthy vigorous plant will generally be less likely to be as effected in the first place, at least from some things. I find that it is when I've been bad at keeping the plants adequately watered or they have other stresses, that they're more likely to start contracting stuff or being attacked by aphids, etc.
I don't think that would do much for TSWV though.
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