Our tree is one the flowers in the spring time, it was great right before the 4th of July, leaves were green and beautiful. We come home on the 6th of July after being gone for one week and the leaves are brown and very dry, there are a few with some green, but not many. What would cause this? We did not have much rain for the week of the 4th. Could this be a cause? Could it be a bug or could someone have put a poison on it while we were gone, like kids goofing around?