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PBS News Hour

In Oregon, Swarms of Pine Butterflies Take Toll on Forests

In Oregon's Malheur National Forest, pine butterflies experience a population explosion for two to three years every three decades. Oregon Public Broadcasting's Oregon Field Guide series explores the snowstorm-like population surge that has stripped needles from 250,000 acres of trees.

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October 31, 2020 - PBS NewsHour Weekend full episode
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October 31, 2020 - PBS NewsHour Weekend full episode
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