I remember reading about parasites being a cause of Colony Collapse years ago, but it was in a more fringe publication, mainstream just kept touting its something we are doing, pesticides, etc... whenever I saw a report about it in the mainstream press.
Amazing how the truth is ignored..
I think I remember running across the same thing, possibly mention of it here.
Check out this comment at Bee-L
Although not bee specific, it mentions another instance of parasites seeming to hijack the nervous system/ behavior of an host insect, causing a suicide type of affair, which benefited the parasite.
You know, sort-of like Obama and his cronies taking over the U.S. and making zombie followers out large portions of the electorate.