Garden Pests and Diseases: What is wrong with these Bradford Pear trees?, 2 by gdhenke

gdhenke wrote:
Hi, I planted 5 Bradford Pear trees a few months ago and the leaves are turning black and falling off....I know very little about plants and trees and am hoping someone can tell me what the problem is and what to do to fix it.... We are in Greenville, Mississippi and there has been very little rain this summer but we water the trees regularly and they were planted exactly as the instructions told us...depth, hole size, potting soil, mulch, etc...

I have attached two pics.. one close up of a leaf and the other of the whole tree.

Any help would be greatly apprecaited!