“Banned EU pesticide affects learning of honeybees but not bumblebees : First-of-its-kind research by the University of Sussex has implications for insecticide regulation” http://www.eurekalert.org/pub_releases/2016-04/uos-bep040516.php The research also looked at how the microsporidian parasite Nosema ceranae, which is a potential major threat to honey bee populations in Europe, affects the memory and learning of both species. The study found that infection by the parasite slightly impaired learning in honeybees, however the parasite did not infect bumblebees. “Chronic neonicotinoid pesticide exposure and parasite stress differentially affects learning in honeybees and bumblebees” is to be published in The Royal Society’s Proceedings B Paper.
“Bee Populations Seem To Be Bouncing Back In Canada, But Not in the US” http://motherboard.vice.com/read/bee-populations-seem-to-be-bouncing-back-in-canada-but-not-in-the-us A new study conducted in part by the US Department of Agriculture says the US lost just over 44 per cent of its bee colonies between April 2015 and March 2016. Two years ago the figure was 34 per cent, down from the 45 per cent loss recorded in 2012-13.
‘Like it’s been nuked’: Millions of bees dead after South Carolina sprays for Zika mosquitoes https://www.washingtonpost.com/news/morning-mix/wp/2016/09/01/like-its-been-nuked-millions-of-bees-dead-after-south-carolina-sprays-for-zika-mosquitoes/ “By one estimate, at a single apiary 46 hives died on the spot, totaling about 2.5 million bees. On Sunday morning, parts of Dorchester County were sprayed with Naled, a common insecticide that kills mosquitoes on contact. The United States began using Naled in 1959, according to the Environmental Protection Agency, which notes that the chemical dissipates so quickly it is not a hazard to people. That said, human exposure to Naled during spraying “should not occur.” A profile of the chemical in Cornell University’s pesticide database warned {see link} that “Naled is highly toxic to bees.”
EU To ‘Completely Ban’ Outdoor Use Of Pesticides Blamed For Devastating Bees https://www.npr.org/sections/thetwo-way/2018/04/27/606355288/eu-to-completely-ban-outdoor-use-of-pesticides-blamed-for-devastating-bees European Union countries voted today for a near-total ban on three neonicotinoid pesticides, including thiamethoxam. Growers will only be free to use neonicotinoids in greenhouses across the EU, despite some environmental groups having reservations about the chemicals leaching into water supplies. Other neonicotinoids, including thiacloprid and sulfoxaflor, will continue to be exempt from the ban.
“Pesticides impair baby bee brain development” https://phys.org/news/2020-03-pesticides-impair-baby-bee-brain.html
“Insecticide exposure during brood or early-adult development reduces brain growth and impairs adult learning in bumblebees”, Proceedings of the Royal Society B, March 4, 2020 https://royalsocietypublishing.org/doi/10.1098/rspb.2019.2442
Also: “Bumblebees acquire a taste for pesticide-laced food as they become more exposed to it, a behavior showing possible symptoms of addiction.” (August 2018) https://phys.org/news/2018-08-pesticides-bees.html “This study of bumblebee behavior indicates that the risk of pesticide-contaminated food entering bee colonies may be higher than previously thought, which can have impacts on colony reproductive success.”
Eideard 
“Banned EU pesticide affects learning of honeybees but not bumblebees : First-of-its-kind research by the University of Sussex has implications for insecticide regulation” http://www.eurekalert.org/pub_releases/2016-04/uos-bep040516.php The research also looked at how the microsporidian parasite Nosema ceranae, which is a potential major threat to honey bee populations in Europe, affects the memory and learning of both species. The study found that infection by the parasite slightly impaired learning in honeybees, however the parasite did not infect bumblebees. “Chronic neonicotinoid pesticide exposure and parasite stress differentially affects learning in honeybees and bumblebees” is to be published in The Royal Society’s Proceedings B Paper.
“Bee Populations Seem To Be Bouncing Back In Canada, But Not in the US” http://motherboard.vice.com/read/bee-populations-seem-to-be-bouncing-back-in-canada-but-not-in-the-us A new study conducted in part by the US Department of Agriculture says the US lost just over 44 per cent of its bee colonies between April 2015 and March 2016. Two years ago the figure was 34 per cent, down from the 45 per cent loss recorded in 2012-13.
‘Like it’s been nuked’: Millions of bees dead after South Carolina sprays for Zika mosquitoes https://www.washingtonpost.com/news/morning-mix/wp/2016/09/01/like-its-been-nuked-millions-of-bees-dead-after-south-carolina-sprays-for-zika-mosquitoes/ “By one estimate, at a single apiary 46 hives died on the spot, totaling about 2.5 million bees. On Sunday morning, parts of Dorchester County were sprayed with Naled, a common insecticide that kills mosquitoes on contact. The United States began using Naled in 1959, according to the Environmental Protection Agency, which notes that the chemical dissipates so quickly it is not a hazard to people. That said, human exposure to Naled during spraying “should not occur.” A profile of the chemical in Cornell University’s pesticide database warned {see link} that “Naled is highly toxic to bees.”
“Nearly two decades of data reinforce concerns that pesticides are really bad for bees” (August 2016) https://www.washingtonpost.com/news/energy-environment/wp/2016/08/16/nearly-two-decades-of-data-reinforce-concerns-that-pesticides-are-really-bad-for-bees/
First evidence found of popular farm pesticides in drinking water (April 5, 2017) https://www.washingtonpost.com/news/speaking-of-science/wp/2017/04/05/iowa-scientists-find-first-evidence-of-popular-farm-pesticides-in-drinking-water/ On Wednesday, a team of chemists and engineers at the U.S. Geological Survey and University of Iowa reported that they found neonicotinoids in treated drinking water. It marks the first time that anyone has identified this class of pesticide in tap water, the researchers write in Environmental Science & Technology Letters. http://pubs.acs.org/doi/abs/10.1021/acs.estlett.7b00081
EU To ‘Completely Ban’ Outdoor Use Of Pesticides Blamed For Devastating Bees https://www.npr.org/sections/thetwo-way/2018/04/27/606355288/eu-to-completely-ban-outdoor-use-of-pesticides-blamed-for-devastating-bees European Union countries voted today for a near-total ban on three neonicotinoid pesticides, including thiamethoxam. Growers will only be free to use neonicotinoids in greenhouses across the EU, despite some environmental groups having reservations about the chemicals leaching into water supplies. Other neonicotinoids, including thiacloprid and sulfoxaflor, will continue to be exempt from the ban.
“Pesticides impair baby bee brain development” https://phys.org/news/2020-03-pesticides-impair-baby-bee-brain.html
“Insecticide exposure during brood or early-adult development reduces brain growth and impairs adult learning in bumblebees”, Proceedings of the Royal Society B, March 4, 2020 https://royalsocietypublishing.org/doi/10.1098/rspb.2019.2442
Also: “Bumblebees acquire a taste for pesticide-laced food as they become more exposed to it, a behavior showing possible symptoms of addiction.” (August 2018) https://phys.org/news/2018-08-pesticides-bees.html “This study of bumblebee behavior indicates that the risk of pesticide-contaminated food entering bee colonies may be higher than previously thought, which can have impacts on colony reproductive success.”