In this Oct. 26, 2011 file photo, forester Jeff Wiegert of the New York State Department of Environmental Conservation points out the markings left from emerald ash borer larvae on an ash tree at Esopus Bend Nature Preserve in Saugerties, N.Y. The invasive pest has killed tens of millions of ash trees in the United States and Canada. A 2011 survey shows the tiny, green beetle hasn't been detected outside of the 15 states where it's already known to exist, but it has been found in more counties in those states than last year. (AP Photo/Mike Groll, File)
Read the article: US survey helps shed light on forest-damaging bug
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