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FILE - In this Oct. 26, 2011 file photo, the markings left from emerald ash borer larvae on an ash tree are pointed out in Saugerties, N.Y. The emerald ash borer, first found in 2002 in Michigan, is now in 30 states and has killed hundreds of millions of ash trees. Forests from New England to the West Coast are jeopardized by invasive pests that defoliate and kill trees. Scientists said the pests are driving some tree species toward extinction and causing billions of dollars a year in damage. (AP Photo/Mike Groll, File)

FILE - In this Oct. 26, 2011 file photo, the markings left from emerald ash borer larvae on an ash tree are pointed out in Saugerties, N.Y. The emerald ash borer, first found in 2002 in Michigan, is now in 30 states and has killed hundreds of millions of ash trees. Forests from New England to the West Coast are jeopardized by invasive pests that defoliate and kill trees. Scientists said the pests are driving some tree species toward extinction and causing billions of dollars a year in damage. (AP Photo/Mike Groll, File)