USDA Forest Service Scientist Nathan Siegert measures the diameter of a maple tree with evidence of ALB in West Boylston, MA

USDA Forest Service Scientist Nathan Siegert measures the diameter of a maple tree with evidence of ALB in West Boylston, MA. Photo by Dave Orwig, Harvard Forest.
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Dave Orwig, Harvard Forest
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Harvard Forest scientists say Asian longhorned beetle spreading in New England forests