'Devastating': Tiny insects are killing giant sequoias in California national parks

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By Eric Brooks, SFGATE. 

Excerpt: [Bark beetles] are black and about 2 millimeters long. They are tiny, but represent a grave threat: They’re responsible for the deaths of 40 giant sequoia trees, and counting, at Sequoia and Kings Canyon National Parks. While the bark beetle and the giant sequoias previously coexisted successfully, climate change is transforming their relationship to one with significant consequences. ...The beetles, native to the Sierra, have literally made their mark on the giant sequoias for hundreds, if not thousands, of years. The two have peacefully co-existed that entire time, until recently, when climate change-related stressors have been introduced into the equation. The two biggest challenges? Intense wildfire and drought. Both have the power to severely weaken even the most resilient of trees. The giant sequoias, known for their ability to harness fire for better reproduction, are no exception to that test. So while the beetles have always been around, they’re only now beginning to damage and kill giant sequoias, as other climate-driven elements are making the treasured trees’ mortality possible.... 

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