Kaki sudden death syndrome -- help?

[lordkiwi]

shockingly similar

SDS (Sudden Death Syndrome) Kaki Decline

Believe I’m seeing Sudden Death/Decline Syndrome in kakis here. Saijo died suddenly over the (relatively mild) winter. Now, certain branches on Ichi-ki-kei-jiro are displaying black leaf veins and defoliating: [20220603_151651] And it’s blooming for the first time, too—dang it! I topworked the virginiana rootostock of the deceased Saijo with Mikkusu (JT-02) this spring. But as the reports in this (old but valuable) thread suggest, that may have been a waste of time, as many hybrids are ap…