Kaki sudden death syndrome -- help?

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SDS (Sudden Death Syndrome) Kaki Decline

I have an old male D. virginiana in my yard that puts up a lot of root suckers, but I’ve never had any success grafting kaki scions to those root suckers after trying dozens of times. The grafts always look like they’re taking and then die back after a month or so. I’ve had good success grafting to the root suckers of purchased kakis grafted onto D. virginiana. Some of my purchased kaki trees succumbed to what looked like SDS (sudden wilting on portions of the tree, blackening veins in the le…