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In many cases the use of insecticides for agricultural pest control has had the unwelcome side effect of killing the bees necessary for maintaining the crop. Such environmental stresses plus several species of parasitic mites devastated honeybee populations in the United States beginning in the 1980s. In 2006-7 commercial honeybee hives suffered from "colony collapse disorder," which, for unknown reasons, left many bee boxes empty of bees after overwintering.
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