Virginia Tech, Logan Wallace / AP
This Nov. 6, 2013, photo provided by Virginia Tech shows a Laricobius osakensis beetle on a branch in Blacksburg, Va. The beetle was first released in the United States in November 2012, after six years of study under quarantine. The beetle will feed upon the woolly adelgid, an insect that has been decimating hemlock trees in the eastern U.S. for decades. The beetle's introduction could help save the native eastern hemlocks.