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Graft looks good. How long ago did you graft?Also, remove the shoots!
How are you making sure the scion does not dry up? Is it indoors? DO you give it shade or keep it under plastic hood?
The graft looks great but don't get too hopeful. Sometimes the scion pushes andstill fails later? The scion has residual energy which can cause the push. As alreadymentioned cut off any suckers that grow from the rootstock and also keep it humid.I don't see the mold but you can spray a little copper fungicide on the area if it persists?I prefer to wrap the scion? What is the scion? Good Luck!
Please post an update if you get a take.It is an interesting dual rootstock graft. Don't move this plant frequently though, without tying the rootstock together you could dislodge part of your graft while moving the plant.