the only strategy could think of is to dig them up and start a mini-nursery using them as rootstock, or if not, just slash them as close to the ground(or deeper than the ground) as possible. Smaller hand shovels usually work well for decapitating.
there are relatively thornless juju cultivars growing on their own roots. Moreover, among wild-type rootstock used by nurseries, there will also be lazy producers of suckers, and there will be prodigious ones. Jujus, being quite hardy and trouble-free, are not as particular as conventional fruits when it comes to rootstock, so growers are likely to just raise roostock from seed(which explains the variability among rootstock).
Or they simply dig up suckers from actively producing rootstock, which was the late Mr. Meyer’s business model.
i currently have four relatively thorn-free cultivars on their own roots: vegas booty, vegas bounty, vegas sweetie, and sihong.
the first three i grew from seed(and named in a bratty way, lol), and the sihong obtained from another juju aficionado
booty and sihong are the least thorny, but perhaps simply because they are older clones.
i wish to establish a jujube grove some day where all the rootstock used are that of booty/sihong etc. Only trouble with sihong is that it bears viable seeds, so may ‘contaminate’ the land it is growing on with new cultivars that might be thorny. Booty seems to be sterile, but too early for me to tell .
also bought 5 cultivars from jfae, sold supposedly on their own roots, but have yet to prove the rootstocks’ identities as there’s just one that sprouted from a root cutting, and hasn’t yet fruited. We update its progress on this other thread. Will be poaching more root cuttings this winter.