D-shaped holes in the bark or new tree shoots emerging at the root zone of your ash trees may be a sign of infestation by the Emerald Ash Borer, an insect native to the Far East that targets ash trees, says Dave Dailey of Birchcrest Tree and Landscape, in Rochester, N.

WSJ: Getting to the Roots of Your Trees' Stress

After public pressure and leadership from a local councilman and the corps' commander, officials at several levels of government created the Los Angeles River Pilot Recreation Zone along a lush segment that features tree-lined islands, vistas of the San Gabriel Mountains and abundant wildlife such as herons, egrets, hawks and kingfishers.

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But if those advocating a euro breakup are barking up the wrong tree, so too are those arguing for the immediate creation of common euro-zone bonds and a banking union.

WSJ: Merkel Still Waiting for a Thatcher Moment