The emerald ash borer has been confirmed in Wagoner and Creek counties. Oklahoma forestry experts explain how it spreads, ...

Something is quietly killing the Midwest’s ash trees. The culprit is small enough to fit on a fingernail, brilliant green in ...

A Colorado city is fighting to save tens of thousands of its trees from a "devastating" death. But it's not deforestation or wildfires they are up against this time – it's a tiny half-inch-long bug.

A reader of ERR's Novaator science portal noticed diseased ash and elm trees in their home yard and asked what was causing it ...