One devastating impact of early logging still causing damage is the monoculture replanting that took place afterward. Areas that were once rich with a diverse variety of trees and undergrowth species were replanted with one species to optimize timber production–if they were replanted at all. Today the monoculture replants face massive infestations of bark beetles which have killed of alarming numbers of trees throughout the western United States and Canada. Each bark beetle species feeds exclusively on one species of pine or spruce. While the beetles are native, they have been able to spread and their populations to grow far more quickly in areas where all the trees in a forest are their food.
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