The woolly adelgid, a pest that attacks and eventually kills hemlocks, continues to spread in Maine, this time leaping from Saco to Harpswell, the single biggest leap since they first entered the state in 1999.

The early infestations were brought in from untreated nursery trees. They were discovered early, and the trees were treated and monitored. Then, in 2004, the first uncontrolled entry was recorded in Kittery, and ever since the adlegids have been making their way northward along the coast.

Meanwhile, for the past several years, the Maine Forest Service has been releasing predator beetles that feel on the larvae, in hopes of controlling the spread.