Varroa destructor mite infestation is the leading cause of honeybee colony collapse globally, causing individual bee suffering and requiring integrated management to protect colony health.
Whether honeybees have welfare-relevant subjective experiences remains scientifically uncertain, but evidence of nociception, pessimistic cognitive bias under stress, and sophisticated learning supports a precautionary welfare approach. Varroa infestation causes physiological harm to individual bees: mites feed on fat bodies (crucial for immune function and longevity), reducing individual bee lifespan by 10-25%. Mites also vector deformed wing virus, causing wing deformities and inability to fly — rendering affected bees unable to forage and likely reducing quality of life by whatever measure applies. At the colony level, collapse causes the deaths of tens of thousands of individuals. Oxalic acid treatment is highly effective and has minimal side effects — a genuine welfare-positive intervention for infested colonies.