Essay
The emerald ash borer (Agrilus planipennis) is an insect from eastern Asia that has invaded North America. The larvae of the emerald ash borer consume the cambium and phloem under the bark of American ash trees and eventually kill the trees. How can biologists predict the spread of this invasive pest? What might explain why the emerald ash borer is more of a problem in North America than in its native range?
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