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  • PBS NewsHour

PBS NewsHour | In Oregon, Swarms of Pine Butterflies Take Toll on Forests | PBS

Duration: 06:44
Program: PBS NewsHour #10282
Broadcast Date: Mar. 12, 2012

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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Post Date: March 12, 2012