Neonicotinoids are a relatively new class of insecticides that share a common mode of action that affect the central nervous system of insects, resulting in paralysis and death. They include imidacloprid, acetamiprid, clothianidin, dinotefuran, nithiazine, thiacloprid and thiamethoxam. According to the EPA, uncertainties have been identified since their initial registration regarding the potential environmental fate and effects of neonicotinoid pesticides, particularly as they relate to pollinators. Studies conducted in the late 1990s suggest that neonicotinic residues can accumulate in pollen and nectar of treated plants and represent a potential risk to pollinators.
There is major concern that neonicotinic pesticides may play a role in recent pollinator declines. Neonicotinods can also be persistent in the environment, and when used as seed treatments, translocate to residues in pollen and nectar of treated plants. http://www.beyondpesticides.org/pollina ... micals.htmhttp://www.wired.com/wiredscience/2012/ ... -collapse/http://edis.ifas.ufl.edu/pi117http://www.beecharmers.org/Pollination2.htmlhttp://www.xerces.org/neonicotinoids-and-bees/