I was going to ask if you had fertilized it and I see that you used a spike for it. I think you burned it. I also think once you prune it up (via Worths advice) it should be okay.
yes... get all the new sucker growth off the trunk below the graft otherwise it will over grow and over compete with the grafted part and ruin the tree.
If the sprouts are still small and green just rub them off. if they are already hard cut them flush up against the trunk. You don't want to leave any part of it to regrow from the same sprouted bud. good luck.
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carolyn k
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