Bark beetles in lodgepolepine used to be more selective, leaving the younger and healthier trees alone.
海滩松上的树皮甲虫会有选择性地寄居在松树上，避开年轻健康的松树。
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The narrow, towering lodgepolepine trees that populate North America's western forests may disappear in the coming decades due to climate change and attacking beetles, a study said Monday.