United Kingdom 
I believe the tree in my garden is a thornless gleditsia/honey locust and suddenly the foliage has wilted.The tree is probably a few years old and is approx.4metres high.
8 Jul, 2012
I thought this was an adaptable tree weather wise but it is one that can get Verticillium Wilt.
Google it to see if it matches the look and symptoms
8 Jul, 2012