Wild and managed honeybee colonies face an existential threat from Varroa destructor mites, which cause colony collapse through parasitism and viral transmission, with profound welfare implications for billions of individual bees.
Individual bees parasitised by Varroa suffer direct physical harm — the mite feeds on fat body tissue during the pupal stage, causing deformities including stunted wings that prevent flight. Adult bees with heavy viral loads show neurological impairment affecting navigation and communication. Colony-level collapse represents the death of tens of thousands of individual insects, each of which, if bees have capacity for suffering, represents genuine welfare harm multiplied by extraordinary numbers. The precautionary argument for managing Varroa in kept colonies is strong. Wild colonies without treatment face near-certain colony death. Supporting Varroa-resistant genetics reduces suffering at enormous scale if successful.