Since a devastating fungal blight popped up in the Bronx Zoo in 1904 and went on to kill at least 3 billion chestnut trees, North American forests have been swept by one plague after another, including a fungus that kills elms and an aphidlike insect that kills hemlocks. No tree has come back—but Koch hopes her approach can usher in an unprecedented era of tree revival.
Can an ambitious breeding effort save North America’s ash trees?

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