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Shenandoah National ParkSunlight rays make their way through the forest and light up Front Royal Cemetery in Shenandoah National Park
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Shenandoah National Park
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The adelgid is visible as tiny white cottony spots on the underside of the hemlock’s branches.  

Did You Know?
The most harmful exotic plants, animals and diseases in Shenandoah National Park include: chestnut blight, Dutch elm disease, dogwood anthracnose, gypsy moths, hemlock woolly adelgids, kudzu, mile-a-minute vine, Oriental bittersweet, and garlic mustard.
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Last Updated: July 18, 2007 at 11:49 EST