Saving Hemlocks An award-winning story By Ben Moyer B UGS don't respect borders. If those bugs are exotic invaders that feed on native trees they'll chew, suck or bore their way across whole landscapes. That's why more than 50 federal, state and local agencies, organizations and businesses are working together to stem the spread of hemlock woolly adelgid (HWA) across Pennsylvania's Al- FEBRUARY 2015 A diverse partnership is working to save Pennsylvania's state tree in its last stronghold. legheny Plateau, including the Allegheny National Forest and popular state parks. Hemlock woolly adelgid is an aphid-like insect native to Asia where it fed on trees related to North America's hemlocks. It arrived in Virginia on nursery stock or packing material in the 1920s and initially spread slowly. But recent mild win7