Roundup is actually an herbicide. It's entirely possible that there is SOME effect in large doses over time, but I don't think I've seen anything to indicate you should try to get notifications and screen in the bees on application days etc.
Another question (just to stir the pot, no one's demonstrated this either way yet) is how your bees foraging on GMO beans might affect their health long-term (the beans have been modified to be able to withstand the herbicide, while the weeds, not similarly immune, die).
Bees, brews and fun
in Lyons, CO