Group:
I have a question re: black-knot in stone fruits/(Prunus spp.) and
fire-blight in pomes/(Pyrus, Malus, Sorbus).
If your'e variety of tree is very black-knot or fire-blight prone, and you
decide to top-graft it with another variety which is not disease prone, will
black-knot/fire-blight yet effect the trunk and limbs of the initial variety;
or does it ONLY effect the tips, so regardless of the degree of
susceptibility of any part of the tree bellow the branches (rootstock, trunk,
limbs), it will only effect the tree if the branches are of a disease-prone
variety?
Thanks,
Steve; NJ
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