I thought at first this might be fall foliage but now I don't think so. The tree has been in the ground since this spring here in zone 8b Southeast Coastal Georgia. It was doing very well. Our temperatures have been 60s-80s for a little over a week, but before that we had several weeks in the 90s. I've watered it weekly soaking it and just added some compost. Is this normal or a disease?