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Oregon Field Guide

Pine Butterflies

An exceedingly rare population explosion of pine butterflies fills the Malheur National Forest with a virtual snowstorm in August. The mysterious outbreak may occur for 2 or 3 years and then disappear for 3 decades. The beauty extracts a price: the butterflies, while caterpillars, ate needles off 250,000 acres of trees.

First Broadcast: 2012
Producer: Vince Patton
Videographer/Editor: Michael Bendixen
Videographer: Nicholas Fisher

More Information
Forest Defoliators
Fact Sheet
OSU Extension 2010 Assessment
Forest Health Protection


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Part of Episode

Open Water Swimming; Pine Butterflies; Radon

Oregon Field Guide: Episode #2308
Original Broadcast: February 2, 2012