Here's an article from NBC News about Varroa Mites and Neonicotinoids as contributing factors for Colony Collapse Disorder. It was also interesting to read that 15% losses are considered acceptable in commercial beekeeping.
http://www.nbcnews.com/science/environment/hope-honeybees-experts-pitch-plan-curb-deaths-n105651
2014 saw bee losses at 23%, which is much better than 31% in 2013.
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