Varroa destructor mite is the most devastating threat to managed honeybee colonies globally. Management approaches have varied welfare implications for both mites and bees.
Varroa management involves complex welfare considerations at multiple scales. Individual bees infested with Varroa suffer from nutritional deficiency as fat bodies are depleted, immune suppression that increases susceptibility to viral diseases, and developmental abnormalities in emerging bees. Untreated colonies die - a welfare outcome for all 50,000-80,000 individual bees in a colony. Treatment decisions have their own welfare implications: organic acid treatments cause short-term disorientation in bees during application; synthetic miticides accumulate in wax and may have long-term effects on bee health. Breeding for Varroa resistance - developing bee lines that can manage mite populations without chemical intervention - represents the most welfare-positive long-term solution, eliminating treatment stress while maintaining colony health.