Question: do systemic insecticides harm bees?
Answer: The truth: Neonics are one of the most toxic classes of chemicals to bees and will kill bees and other beneficial insects, even at very, very low levels. In fact, systemic pesticides have been shown to be 5,000 to 10,000 times more toxic than DDT. ... The doses are sublethal so the bees don't die outright.