Ash Trees

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Researchers say an invasive beetle that's destroyed tens of millions of ash trees in the U.S. and Canada may have arrived in North America a decade before it first was detected.   Michigan State University researchers collected cores from trunks of more than 1,000 ash trees in six southeastern Michigan counties.

Agricultural Experiment Station / © Bugwood.org / CC-BY-3.0-US

Hemlock trees in Michigan face an insect threat similar to the bug that wiped out most of the state's ash trees.  WEMU's Bob Eccles has the story.