Ash tree variability may offer restoration path post-beetle decimation

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The invasive emerald ash borer, according to the U.S. Department of Agriculture, was first found in the United States in southeast Michigan in 2002. In the decades since, the wood-boring beetle has spread east and west across the U.S. and Canada, killing tens of millions of ash trees, causing one of the costliest forest insect invasions to date. More than 90% of all ash infested by the insect native to Asia eventually die, threatening to make the tree species functionally extinct in North America. In response, researchers are working to identify and develop ash trees genetically able to withstand the beetles' onslaught and strategize how to restore ash to forests.

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