- Associated Press - Tuesday, June 23, 2015

DES MOINES, Iowa (AP) - Officials say an invasive insect that kills ash trees has been confirmed in Poweshiek (POW’-eh-sheek) County, bringing the total to 25.

A news release from the Iowa Agriculture Department said Monday that a larva sample of an emerald ash borer was taken from a tree in Grinnell on June 16.

The larva of an emerald ash borer cuts off an ash tree’s flow of nutrients when deposited below the bark. Once infected, trees typically die within five years.

The insects are native to Asia and were first spotted in the U.S. in 2002, when they showed up in the Detroit area. They devastated ash trees in Michigan and have spread to at least 21 other states.

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