Dying tree?

Asked July 8, 2016, 2:30 PM EDT

We have two trees growing side by side. One has been dropping leaves for several weeks. We first thought it was caused by the very hot temperatures a few weeks ago, but only one tree is dropping leaves. Attached is a photo of the two trees - the problem tree is in front. And a photo of the leaves on the lawn. Your thoughts are most appreciated.

Washington County Oregon

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