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Forest Service, has documented the current extent of the adelgid infestation and created a model for predicting its severity around the Uinta-Wasatch-Cache National Forest.

The hemlock woolly adelgid -- an invasive insect that was introduced to North America 70 years ago and has spread along the East Coast -- can kill a hemlock tree in as little as four years.

Similarly, millions of hemlock trees in the eastern United States are succumbing to the woolly hemlock adelgid, which likely arrived on Japanese ornamental plants.

The hemlock wooly adelgid is a tiny insect that has killed tens of millions of hemlock trees while spreading northward from the Appalachian region.

Parasitoids have often proved to be more successful biocontrol agents than predators, like those that might tame the woolly adelgid, because parasitoids are more likely to target a single species, causing less collateral damage.