Neonicatinoids are probably what's killing all the bees.
Did Scientists Just Solve the Bee Collapse Mystery? | Mother Jones
The hardest-to-avoid menace of all might be the neonicotinoid class of pesticides, widely used not only on big Midwestern crops like corn and soybeans but also on cotton, sorghum, sugar beets, apples, cherries, peaches, oranges, berries, leafy greens, tomatoes, and potatoes. They're even common in yard and landscaping products. I've written before about the growing weight of science linking these lucrative pesticides, marketed by European agrichemical giants Bayer and Syngenta, to declining bee health, including the annual die-offs known as colony collapse disorder, which began in the winter of 2005-06.
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And now, a new Harvard study fingers neonics as the key driver of colony collapse disorder. The experiment couldn't have been simpler. Working with nearby beekeepers, Harvard researcher Chensheng Lu and his team treated 12 colonies with tiny levels of neonics and kept six control hives free of the popular chemicals. All 18 hives made it through summer without any apparent trouble. Come winter, though, the bees in six of the treated hives vanished, leaving behind empty colonies—the classic behavior of colony collapse disorder. None of the six control hives experienced a CCD-style disappearing act, although one did succumb to a common-to-bees gut pathogen called nosema.