Vol. 12, Issue 3 (2023)

Author(s):
Debanand Biswas, Neeraj Kumar, PP Singh, Rabindra Prasad, GS Giri and Sonali Nakambam

Abstract:
The current investigation was carried out during Kharif seasons of 2020-21 at the experimental field of TCA (Dholi), RPCAU, Pusa, Bihar. The number of important insect visitors on Yam bean flowers was counted in an area of one square meter marked randomly in the experimental plot. It was kept free from any spray during the entire flowering period. Observations were recorded at 07:00, 11:00, 13:00, and 15:00 hours of the day at weekly intervals on different dates for 10 minutes. Results obtained showed that in Hymenopteran order the most frequent insect visitors were Giant honeybee (Apis dorsata Fabricius 1793), Eastern honeybee (Apis cerana Fabricius 1798), Dwarf honeybee (Apis florea Fabricius 1787), European honeybee (Apis mellifera Linnaeus 1758), Megachile sp. Fabricius 1781 and Violet carpenter bee (Xylocopa fenestrata Linnaeus 1758). The mean population (different dates) of Apis mellifera with 12.23 insects/m²/min was highest followed by Xylocopa fenestrata with 12.12 insects/m²/min, Apis cerana indica with 11.38insects/m²/min, Apis dorsata with 11.21 insects/m²/min, Megachile sp. with 9.85insects/m²/min and lowest population of Apis florea with 7.67 insects/m²/min. All the insect pollinators were found to be highest during 13:00 hrs of the day and lowest during 07:00 hrs of the day.