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December 2, 2009 3:31 PM

Mysterious bee killer is breaking out in hives

Last winter, 29 percent of U.S. bee hives were lost to the mysterious phenomenon known as colony collapse disorder. The disorder, first noticed in 2005, as a variety of suspected causes: pesticides, varroa mites, viruses, stress from shipping hives long distances to pollinate crops — or some combination.

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