Many of my new grafted jujubes this year have developed orange highlights at the graft union and now the orange discoloration is creeping upward on a few of them.
Does anyone know what is going on?
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i have seen that happen here, but so far no deadly results despite the bark literally splitting and scarring up. Will take a picture when get the chance.
hopefully the reason for what’s going on with yours is the same reason for mine(being scary, but not deadly, at least not yet)
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So far all the trees seem healthy, but this is very odd.
at least your ‘misery’ has some company
just hoping it is the same minor malady that have experienced . Jujus are knowtn to self-amputate, as if to contain the infection(the infection that is yet unknown to us yanks as to what it might be)
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I have seen that… maybe it’s the colors of their SUPER POWERS!! 
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so here is the orange-ish malady that pretty much girdled the sihong-on-contorted graft junction(contorted seen as lower portion with rough bark), which started just like on the photo you posted above. Soon it cracked open but now re-organizing with vigorous creeping cambium.
below is the tree that seems unfazed other than not being overly productive. Graft junction is encircled in yellow
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Looks like sunburn injury which later splits the bark wide open.
There’s no evidence of canker. So, ??? that’s my guess.
Dax
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I agree with @barkslip. Dax your likely going to mention or perhaps everyone knows already but painting the trunk is in order. Here is a thread Painting trunks for sunburn and rodents
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Thanks for mentioning that, Clark.
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Mine is absolutely not sunburn.
Where did your trees with the orange stuff come from?