Here's a great discussion about neonicotinoids in response to a question posted on the Garden Professors Blog page on Facebook. (I have X'd out people's names.)
Neonicotinoids are systemic insecticides, which have been widely used on plants sold in garden centers. Now people are realizing that these poisons are detrimental to our pollinators. This discussion includes good solid resources The problem with most readily available information is lack of scientific references.
I hope you find this useful. Sustainable gardeners love their pollinators.
Green Gardening Matters,