The article blames 10% of local collapses on these particular bees. I suspect "mystery" means a complex system with multiple interacting causes. This is one of them buy may only exist in a few places in the world.
The USDA has kept the American bees' gene pool thin since the 70s; in the name of fighting "Africanized Killer Bees." suggesting a link between that and modern bee problems means one is a right wing, anti-government conspiracy theorist, in my experience.
