NPR produced a story today about a newly-discovered parasite that affects them in a way similar to the behaviors observed in association with Colony Collapse Disorder.
"The honey bee population of North America is declining and new research may help answer why. It shows the bees can become hosts of a fly parasite, which causes them to become disoriented and leave their nests. Scott Simon talks with San Francisco State University's Andrew Core, who authored the study."
Here the report here: