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The current honey bee decline necessitates the use of alternative native pollinators to ensure global food security. Here, we compared the pollination behaviour and efficiency of the African honey bee ( Apis mellifera ) and six African endemic Meliponini ( Meliponula bocandei, Dactylurina schmidti, Meliponula lendliana, Hypotrigona gribodoi, Meliponula ferruginea  and  Meliponula togoensis ) in a greenhouse with the non-parthenocarpic cucumber variety  Super Marketer . Honey bees and  D. schmidti  started foraging on introduction in the greenhouse, while  M. lendliana  and  M. togoensis  showed the longest delay. In most species, foragers collected nectar and pollen, excepting  M. bocandei  that specialized in nectar collection, and  H. gribodoi  and  M. togoensis,  specialized in pollen collection. African honey bees visited flowers the shortest, while  H. gribodoi  and  D. schmidti  had a 2-fold probing time, on average. Most stingless bees species had a lower hive activity with fewer foragers encountered per hour than for honey bees, except  D. schmidti .  M. bocandei, M. ferruginea ,  A. mellifera scutellata  and  H. gribodoi,  yielded a seed germination percentage of around 90%.  M. lendliana ,  M. togoensis  and  D. schmidti  yielded a much lower seed germination percentage around 30%, which indicates that the quality of pollination was remarkably lower by using these three species. The highest sugar content was recorded in fruits from flowers pollinated by  M. bocandei,  African honey bees , D. schimdti  or  M. togoensis  with the same solid content as the gold standard method, i.e., hand cross-pollination. We found that  M. bocandei  was the most efficient cucumber pollinator of all species tested: because pollination by this species yielded the largest and heaviest fruits and the highest seed numbers.

African endemic stingless bees as an efficient alternative pollinator to honey bees in greenhouse cucumber ( Cucumis sativus L)