SALISBURY — Pulling back the flaking bark of the green ash tree with the ease of someone peeling an orange, Jay Bolin exposes the evidence he expected to find. “Look at those D-shaped exit holes,” he ...

Winter isn’t the ideal season for pruning trees in Upstate New York, but it’s the best time to cut scion or twigs from ash trees in parts of the state where the species has been all but wiped out.

Ash trees in the UK are rapidly evolving resistance in response to ash dieback disease, DNA sequencing of hundreds of trees has shown. The finding is good news, says Richard Buggs at the Royal Botanic ...