Invasive species contribute to tree death

Alan Tepley / Smithsonian Conservation Biology Institute
April 30, 2020
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Close-up of pests on hemlock needles
Alan Tepley / Smithsonian Conservation Biology Institute

The hemlock woolly adelgid, an insect native to East Asia, feeds by sucking sap from hemlock and spruce trees. It has decimated hemlock populations in Shenandoah National Park and beyond.

Photo credit: Alan Tepley/Smithsonian Conservation Biology Institute

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