Pennsylvania state officials banned the transportation of ash trees and firewood into or out of Allegheny, Butler, Beaver and Lawrence counties after an emerald ash borer -- a tiny green beetle from Asia -- was discovered in a tree in Cranberry.
The Pennsylvania Department of Agriculture ordered the quarantine in an attempt to protect the state's ash trees, which are commonly used in roadside landscaping because of their ability to tolerate road salt. The wood, which is pliant yet tough, is used to make baseball bats.
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