Hi, Fred! I think you are best off bringing a sample in to your local office, so they can look for some of the other symptoms of verticillium wilt. With the weather we've had so far this season, it could be ANYTHING! Call Tracy Jo Mulliken, 309-756-9978, and ask her the when, where, and how big. You might also bring her some photos of both trees - close up and far away, to help her assess what is happening. Good luck!