Beekeepers use a bee smoker to calm bee colonies before transferring them to another crop after pollinating a blueberry field near Columbia Falls, Maine June 23, 2014. Over recent years, bees have been dying at a rate the U.S. government says is economically unsustainable. Honey bees pollinate plants that produce about a quarter of the food consumed by Americans, including apples, watermelons and beans. A lawsuit has now been filed by environmental groups in the United States seeking an injunction restricting the approval of a controversial class of pesticides known as neonicotinoids, or 'neonics'. These pesticides have become a subject of scrutiny in Europe and the United States as concern has mounted that they harm honeybees and other pollinators. Picture taken June 23, 2014. REUTERS/Adrees Latif (UNITED STATES - Tags: BUSINESS ANIMALS ENVIRONMENT AGRICULTURE)

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