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ABSTRACT: The experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Dhaka to observe the foraging behavior of Apis mellifera in sesame field. The treatments were T1 (Caged with honeybees); T2 (Caged without honeybees) and T3 (Open plot). The result revealed that the highest number (101.8) of Apis mellifera pollinator visitation was in T1 treatment. The highest number of pollinator visitation was recorded from 6:00 to 9:00 am in all the three treatments. Whereas, the lowest number of visitation was recorded in mid-day (2:00 to 3:00 pm). T1 treatment caged with honeybee was the most effective in increasing flower number per plant (101.25), number of capsule per plant (86.5) and number of seeds per capsule (56.8) followed by the T3 treatment, which was significantly different. The 1000-seed weight was the highest in T1 (3.5 g) treatment followed by T3 (3.20 g). Yield of sesame was the highest (1.2 t/ha) in Caged with honeybee followed by open plot. Insect of Hymenoptera order increased (38.0%) with increasing percentage of flowers. The majority of the sesame flower bloomed between third and fourth week and flowering lasted for 42-50 days. Most of the bees were recorded when the number of flowers per plant was maximum (83.5) at the fourth week of flowering. Bee population decreased with the diminishing of flowers per plant due to advancing age of the crops.
Keywords: Honeybee, pollination, pollinators, sesame, yield
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