Almost 20 years after the woolly adelgid arrived at Nay Aug Park and started threatening the hemlocks in and around the gorge, officials believe they’ve finally gained the upper hand against the invasive, tree-killing pest, thanks in large part to a predatory beetle called S. tsugae.

Read more: http://thetimes-tribune.com/news/beetles-making-difference-in-woolly-adelgid-fight-at-nay-aug-park-1.2180821