I was a boy when Dutch Elm Disease killed most of the stately American elms that shaded our streets. Spongy moth caterpillars stripped the foliage of our oaks, killing many of them. Hemlock woolly ...

Since the early 2000s, the emerald ash borer has been a thorn in homeowners’ sides—or anyone with trees in their yard. These invasive insect pests cause oft-catastrophic damage to ash trees, and ...