Aptness of diverse queen cup materials for larval graft acceptance and queen bee emergence in managed honey bee (Apis mellifera) colonies

Artificial queen rearing has changed the beekeeping business in contrast to natural queen replacement, as it provides a newly mated queen into a bee colony, reduces the time between eggs not being laid, and increases the production of young bees in a colony. This study was conducted to investigate the larval acceptance rate grafted in queen cups made from different materials and to find out whether the various materials used for queen cups were suitable for the acceptance of grafted larvae in cell builder colonies. The evaluated materials included fresh bee wax (T1), old bee wax (T2), uncapping bee wax (T3), pure paraffin (T4), 50% paraffin + 50% old bee wax (T5), and brown plastic queen cups (T6) as a control. Results indicated that T3 was the material that most increased the larval acceptance (5.2 ± 0.37), followed by T4 (2.4 ± 0.5), T2 (2.2 ± 0.58), T5 (1.8 ± 0.37), T1 (1.6 ± 0.4), and minimum larval acceptance was in the T6 (1.0 ± 0.4) respectively during the spring season of the year 2020–2021. Similar findings were reported of larval acceptance rate during the spring season of 2021–2022. In addition, the wax material that least affected larval acceptance was the fresh comb bee wax. However, all materials used were coupled with a more larval acceptance rate than the control treatment during both spring seasons of 2020–2021 and 2021–2022. The larval acceptance rate was statistically significant in T3 as a compared to other queen cell cup materials during the both spring seasons (p = 0.001). These findings imply that using different types of bee wax for preparing queen cell cups during larvae grafting, particularly uncapping bee wax, may stimulate and promote grafted larvae acceptance during the queen rearing process.