"I consider air pollution and climate change to be serious, long-term threats to the forests," said Gary Lovett, senior scientist at the Cary Institute of Ecosystem Studies in the Hudson Valley. "But neither of those is changing the forest the way the pests are." There are more than 400 forest pests in the country with every state affected. Imported tree pests long ago wiped out eastern chestnuts and elms. Now under siege are hemlocks, ash, beech, oaks, maples and dogwood.
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