In the spring of 2016, Bonnie Prushnok noticed a dying tree in the neighborhood across the street from her condo. It had a strange appearance, she said, like it was gasping for life.
Its branches on top were bare, as if dormant for winter. But the lower branches looked full and healthy. A few months later, dozens of mature ash trees in her neighborhood, Reynolds Farm in Longmont, took on a similar characteristic.
"Branches would just break off," said Prushnok, vice president of the Reynolds Farm Homeowners Association. "That was the beginning."