Watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai) is a highly pollinator-dependent crop in which honey bees play a vital role in ensuring successful fruit set and yield. However, insecticide applications during the flowering period may adversely affect honey bee foraging and pollination efficiency. The present study evaluated the pollination efficiency of Apis cerana under cyantraniliprole and tolfenpyrad treatments in the watermelon ecosystem. Pollen and nectar foraging activity declined markedly in insecticide-treated plots on the 1st, 3rd and 5th days after spraying, with the greatest reduction observed on the first day. From the 7th day onward, foraging activity showed an increasing trend, while outgoing forager activity appeared similar across treatments. Tolfenpyrad (3.92 ± 0.17 fruits vine-1; 41.65 t ha-1) and cyantraniliprole (3.85 ± 0.26 fruits vine-1; 41.44 t ha-1) under bee-colony conditions produced significantly higher fruit set and yield than their corresponding treatments without bee colonies (p < 0.001), whereas the water spray control without bee colony recorded the lowest yield (20.37 t ha-1) highlighting the critical role of managed bee pollination in enhancing watermelon productivity. These findings indicate that, under the conditions of this study, the integration of managed A. cerana colonies with the judicious use of cyantraniliprole (90 g a.i. ha-1) and tolfenpyrad (150 g a.i. ha-1) can sustain pollination services and improve watermelon productivity.