https://www.sciencedaily.com/releases/2019/10/191005134022.htm

Randy Rucker, a professor in the Department of Agricultural Economics and Economics in the MSU College of Agriculture, began looking into colony collapse disorder several years ago with colleagues from North Carolina State University and Oregon State University, for the purpose of estimating its economic impacts. The onset of the disorder was an unexpected shock to commercial beekeeping and pollination markets that first received national attention in the winter of 2006-07 when mortality rates were estimated to be almost 30%.

Colony collapse disorder is still a poorly understood phenomenon, wrote Rucker and his co-authors in the paper's introduction. Since its onset, along with other pollinator health issues such as the Varrona mite, which feeds on developing bees, it has caused significant concern among beekeepers and the public.