By Associated Press - Friday, March 4, 2016

DECORAH, Iowa (AP) - State officials say an invasive insect that kills ash trees has been discovered in Decorah.

The Iowa Department of Agriculture announced Friday that a sample collected from a tree that appeared to be infested was confirmed as an emerald ash borer.

With Winneshiek County added to the list, there are now 31 Iowa counties where the pest has been confirmed.

This is the second confirmed infestation in Iowa this year, following a discovery on the University of Iowa campus in February.

The insects are native to Asia and were first spotted in the U.S. in 2002, when they showed up in the Detroit area. Authorities say the insects have spread to at least 25 other states, killing millions of trees. Once infected, trees typically die within five years.

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