Ask-a-Dave's-Gardener: Major Tree Problems - Help, 3 by RobertCowan

RobertCowan wrote:
These trees have been planted for about 6 years and have always been very healthy until now. All of a sudden one tree lost all of its leaves in a period of 2 days and the tree next to it is starting to do the same thing. Some leaves are crunchy and dead and others have turned color and fallen off like it\'s fall. Our temps have been hot as is typical. Could it somehow be a water or fertilizer issue? These trees are beautiful, please help.