Bark Beetles http://knau.org en Earth Notes: Bark Beetles in a Warming West http://knau.org/post/earth-notes-bark-beetles-warming-west <p>For many residents of the mountain west, warmer temperatures may not sound too bad.</p><p>But small differences in temperature can make a big difference.</p><p>Consider bark beetles. They&rsquo;re native to the region&rsquo;s conifer forests. Normally, the insects emerge in summer. Females bore into the cambium layer of trees and sever vessels that contain resin, releasing a sticky flow that &ldquo;pitches out&rdquo; the beetles. But in weaker trees that lack sufficient resin swarms of beetles can quickly chew enough wood tunnels to kill their hosts.</p> Wed, 06 Jun 2012 11:00:00 +0000 Rose Houk 15002 at http://knau.org Earth Notes: Bark Beetles in a Warming West