A long crack shows up in the trunk of the oak that shades your driveway, or a tree that stood straight for twenty years seems to tilt a little more after a windy week. Worry is a reasonable response....

Walk down almost any residential street and you will find a tree whose trunk drops straight into the ground like a fence post, often inside a tall ring of fresh mulch. The yard looks well kept, so...

Thrips damage tends to announce itself weeks after the fact. You pass a hedge you have looked at all summer, and the foliage has gone dull silver in patches, with tiny black specks scattered across...