Lee Fang in The Intercept:
In September 2009, over 3,000 bee enthusiasts from around the world descended on the city of Montpellier in southern France for Apimondia — a festive beekeeper conference filled with scientific lectures, hobbyist demonstrations, and commercial beekeepers hawking honey. But that year, a cloud loomed over the event: bee colonies across the globe were collapsing, and billions of bees were dying.
Bee declines have been observed throughout recorded history, but the sudden, persistent and abnormally high annual hive losses had gotten so bad that the U.S. Department of Agriculture had commissioned two of the world’s most well-known entomologists — Dennis vanEngelsdorp, a chief apiary inspector in Pennsylvania, then studying at Penn State University, and Jeffrey Pettis, then working as a government scientist — to study the mysterious decline. They posited that there must be an underlying factor weakening bees’ immune systems.
More here.