Roundup weed killer may play role in widespread bee deaths..

Roundup weed killer may play role in widespread bee deaths, study finds.For the past decade, bee colonies have been dying off in high numbers. A new study suggests the widely used herbicide Roundup may be playing a role. The research, published in the journal Proceedings of the National Academy of Sciences, finds that honeybees exposed to glyphosate, the active ingredient in the Monsanto weed killer, lose some of the beneficial bacteria in their guts, thereby becoming more susceptible to infection and death from harmful bacteria.