Went outside yesterday, found 2 yr old laying on its side. Cracked at and below the graft.
I tried to recover by doing a couple of bark grafts on the stump. I have low expectations. Found a couple wild mangos to graft onto too.
Sorry for your loss I have not had one crack that low. I have had a cleft graph that I put on a old tree at about the 5 ft ht. get blown off when it had a similar amount of top growth.
There is a chance some of yours is still your desired variety and hopefully it will sprout out on the slither sticking up. Mine did split very similarly and the slither had numerous new limbs form in a few weeks and it actually helped prevent future wind damage due to becoming so bushy from the split area regrowth and lower & closer to the ground & out of upper winds (previously the cleft graph was about 4 foot up from original old tree with most of the branching far from the old tree & too high in the wind).
Good luck and don't cut off the slither. Do not make a smooth flat cut. Do not cut off even a mm till you see what will sprout and where.
There looks to be plenty of good Lemon Zest budwood on that tree. Best to graft o to a seedlinv to start anew or top work onto existing tree to save it. Relying on that sliver, even if it does shoot out a LZ growth, it will most likely not be the healthiest of trees.
As I mentioned, I would not cut off even a mm of the slither. I would use the existing good grafted slither a chance to sprout new limbs instead of risking your few possible buds on a graft attempt unless you are an expert at bud grafting.
My slither was higher up the limb and I will include pictures of the Now very healthy growing grafted limbs after a little over a year since the wind took off the top. The tree actually has an Easier Time of healing the graft on a slither IMO as the amount of xylem is small to have to circle with new cambium/phloem vs. a large limb. This is evident in almost all old big limb removal where years may pass to finally circle the cambium around the xylem to help prevent rot etc. etc. etc....
But, many don't see the obvious....However, pictures will follow for your amusement.
Original Cleft Graft picture one
2nd picture: Obvious tip of slither where new limb cambium quickly circled slither and continued upward.
3rd picture: Obviously a very healthy tree...