The leaves have turned yellow and 99% of the leaves have brown spots.

I remember one time while in the North Country, I witnessed a group of turkey vultures gathered in a field off the side of an unknown road in Canton. It was quite a sight, seeing a bunch of those large, magnificent birds all gathered in one spot around what was presumably some sort of carcass. I also recall, both in the North Country and at my home in Pennsylvania, spotting many turkey vultures in the air spiraling around a specific location and wondering what had died, and how it passed.