If you want proof for how the emerald ash borer can leap across the landscape, check out the latest map from the Pennsylvania Department of Conservation and Natural Resources.
The small insect, an Asian invasive that was first detected in Michigan in 2002, kills ash trees. As it moved through Detroit, the streets became lined with dead or dying trees, and municipalities were strapped for funds as they realized they had to cut the trees down to avoid a public safety problem.
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