Science Daily Source: Harvard School of Public Health May 9, 2014
Two widely used neonicotinoids -- a class of insecticide -- appear to significantly harm honey bee colonies over the winter, particularly during colder winters, according to researchers. The study replicated a 2012 finding from the same research group that found a link between imidacloprid and Colony Collapse Disorder, in which bees abandon their hives over the winter and eventually die. The new study found low doses of a second neonicotinoid, clothianidin, had the same negative effect.
Further, although other studies have suggested that CCD-related mortality in honey bee colonies may come from bees' reduced resistance to mites or parasites as a result of exposure to pesticides, the new study found...
Two Common Types of Insecticide Found To Harm Honey Bee Colonies