Managed honey bee colony losses are of concern in the USA and globally. This survey,
which documents the rate of colony loss in the USA during the 2015–2016 season, is the
tenth report of winter losses, and the fifth of summer and annual losses. Our results
summarize the responses of 5725 valid survey respondents, who collectively managed
427,652 colonies on 1 October 2015, an estimated 16.1% of all managed colonies in the
USA. Responding beekeepers reported a total annual colony loss of 40.5%[95% CI 39.8 …

Declines of pollinators and high mortality rates of honey bee colonies are a major concern,
both in the USA and globally. Long-term data on summer, winter, and annual colony losses
improve our understanding of forces shaping the viability of the pollination industry. Since
the mass die-offs of colonies in the USA during the winter of 2006–2007, generally termed
“Colony Collapse Disorder”(CCD), annual colony loss surveys have been conducted. These
surveys gage colony losses among beekeepers of all operation sizes, recruited to …