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characteristics that make them pest-resistant, are likely to survive and produce a better genetic strain of trees that, in turn, will thwart new infestations.
And sometimes the disappearance of one native species in an area can mean the emergence of another. With the passing of the hemlock in the Limberlost, for example, the forest canopy has opened, allowing sunlight to reach species that have been lying in wait on the forest floor. Black birch seedlings and saplings are now filling the area where the towering hemlocks once reigned.
Acknowledging that complete eradication of forest pests is unlikely, Shenandoah has changed its adelgid management strategy to trying to save enough healthy individual hemlocks to ensure regeneration after infestations of the pest have subsided. When it comes to the hemlocks, Gubler says, the park is “committed to pre
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