Adelgid Threatens Eastern Hemlock
In southern New England and Pennsylvania, the hemlock has been under attack by the hemlock woolly adelgid, Adelgus tsugae. There is enough fear of its spreading north that Vermont, New Hampshire and Maine have quarantined hemlock logs and nursery stock from infested areas since 1988. The hemlock woolly adelgid is an aphid-like insect native to Asia that was found in British Columbia in 1922 and had spread to Oregon by 1924. It feeds on all hemlock species but is far and away more deadly to the two eastern species than to the hemlocks out west or to those in Asia. First found in the east in Pennsylvania in the late 1960s, it has advanced erratically, confounding predictions about its long-term impact.
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