Colony Collapse Disorder has devastated managed honeybee populations, reflecting combined stressors from pesticides, parasites and disease that compromise bee welfare and ecological services.
Colony Collapse Disorder reflects the multiple stressors that modern managed honeybees face from the combined effects of intensive agricultural practices. At the individual bee level, bees affected by varroa-transmitted viruses show shortened lifespans, impaired learning and navigation, and behavioral changes. At colony level, the collapse of a hive represents the death of tens of thousands of individuals. The combined stressor model — pesticides weakening immune systems, varroa transmitting viruses, poor nutrition from monoculture landscapes — shows how industrial agricultural systems create welfare problems for even unintended species. Addressing CCD requires reducing all these stressors simultaneously through pesticide reform, varroa management and landscape diversity.