The trees of Cook Forest State Park survived the clear-cutting of Pennsylvania more than a hundred years ago. Now the virgin old-growth hemlocks in the park are threatened by a pest that has plagued trees from New England to Georgia. This spring, WPSU's Emily Reddy tagged along with a group headed out into the forest to save the hemlocks.
Pests Threaten Iconic Hemlock Trees
By EMILY REDDY • July 18, 2013