Can an ambitious breeding effort save North America’s ash trees?
A beetle on the march Since the emerald ash borer (EAB) was discovered in Michigan in 2002, it has spread widely into areas where ash trees grow.
In 2015, Koch’s team published its first major paper on ash, reporting that lingering green ash trees killed significantly more larvae than control trees.
By the time borers have reached such densities, they will have likely already killed almost all large ash trees, experts say.
But she’s starting to recruit help by building a network of government and nonprofit organizations to grow and plant resistant ash trees.