The Robusto is the only plumtree that I’ve gotten that’s on peach rootstock that has lived more that three years. I think something, possibly nematodes, possibly borers first weakens the root stock, then stem canker takes out the whole tree but starts in the scion. The trees did seem to show sign of disease from the bottom up rather than from the top down. The Euro plums did not last long either, but they seemed to die of stem canker or something similar from the tops down, and then the Mariana rootstock persists and suckers, and in the case of one tree, becomes my best plum tree. I’m thinking using a plum root stock and resigning one’s self to having to mow down suckers regularly is the way to go. It makes for bigger trees. But for the life of me I don’t see the benefit of the peach root stock, at least not here. I say use a seedling from an improved Chickasaw for Asian and Chickasaw types and Mariana or maybe Monson or possibly hog plum if you don’t want suckers for everything else.
Oh, that reminds me. I need to go out in the woods and look for hog plums for seeds. I want to see how easy it is to graft on since they do not seem to sucker at all. God bless.