Hi, I have noticed some strange things with my Emperor Japanese Maple. First I noticed, that the leaves look like something is eating away at them. Not all, but maybe 25% of them. Second, the bark just does not look right. It is kind of coated with something, and their is also this "yellow" hard powdery stuff in the crevices. Lastly, and perhaps the most concerning, is I noticed a crack develop at the base of the trunk. I am almost positive this was not there when I planted it. I planted this in April. Please help!!!! What can I do? Is this tree a goner? I do have a 1 year warranty on the tree.

Thanks in advance, pics below