Emerald ash borer in the United States

September 4, 2013 | 6:00 a.m. CDT
The emerald ash borer beetle, a wood-infesting insect, is endangering ash trees across North America. First discovered in the United States in 2002, the emerald ash borer has now spread to 20 states. To prevent the spread of the insect, the USDA requires permits for the transport of wood products from the infested areas.

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