I have just moved here (Vancouver, WA) and am just getting started on my garden. We have an enormous English Laurel hedge that borders our neighbor's property. It is very lush and green except for one small area where the leaves have turned completely brown. Here is a photo of one of the leaves that is beginning to turn brown. Can anyone identify this problem for me? What should I do? I have cut off the dead leaves but do not want this to start spreading.