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Queen mandibular, tergal, tarsal and Dufour's gland secretions, as well as brood phero- mones regulate worker reproduction in honeybees. In South Africa two contiguous populations of honeybees exist, Apis mellifera capensisand A. m. scutellata. Queenless A. m. capensisworkers are reproductively distinct from workers of other races, in that they readily develop into pseudoqueens with rapid ovary and signal development. A. m. capensisqueens are pheromonally competent in regu- lating reproduction in the resident workers. Recently however Cape honeybee workers have success- fully invaded queenright A. m. scutellata colonies and simultaneously escaped reproductive suppression from the resident queen and brood. These "social parasites" rapidly develop into reproductives, lay acceptable eggs and mimic a series of queen pheromones. This pheromone mim- icry by invading A. m. capensisworkers causes a breakdown in reproductive regulation, resulting in reproductive anarchy. Apis mellifera / worker reproduction / caste plasticity / pheromones / social parasite

Pheromone mimicry by Apis mellifera capensis social parasites leads to reproductive anarchy in host Apis mellifera scutellata colonies