Read the question and answer section found on this page about "What's up with all the bees?" The guys claims to be an expert and says something about a fungus in feral colonies...anybody ever heard of such a thing? see the url below:
I don't know if copying and pasting this will work. You may have to copy and paste one section at a time onto the URL line in order to access it since it won't fit onto this page in a single line.