Author(s): A. SASMAL, B. PATRO AND P. K. SARANGI

Abstract: Present investigation was carried out to evaluate the efficacy of some insecticides and their can mixtures against major insect pests of rice during Kharif seasons of 2013, 2014 and 2015 at Regional Research and Technology Transfer Station (RRTTS), Coastal Zone, OUAT, Bhubaneswar, Odisha. The experiment constituted eleven treatments such as profenophos 50EC @1000ml ha-1, cypermethrin 10EC @500ml/ha, flubendiamide 39.35EC @125ml ha-1, thiacloprid 240SC @625ml ha-1, imidacloprid 30.5SC @150ml ha-1, profenophos 40% + cypermethrin 4% @440ml ha-1, ethiprole 40% + imidacloprid 40% @ 125g ha-1, flubendiamide 240SC + thiacloprid 240SC @300ml ha-1, fipronil 0.3%G @20 kg ha-1, monocrotophos 36EC @750ml ha-1and untreated control for comparison. All the treatments significantly reduced the major insect pests in comparison to the untreated control due to their specific mode of action. The results clearly indicated that flubendiamide 240SC + thiacloprid 240SC @300ml ha-1was most effective in management of major insect pests in rice by reduction of 71.24 per cent dead heart (DH) and 66.26 per cent white ear head (WEH) caused by stem borer, 86.39 per cent silver shoot (SS) by gall midge, 48.48 per cent infested leaves by leaffolder (LF), 91.15 per cent in population of brown plant hopper (BPH) over untreated control. Apart from that the said treatment could achieve highest average yield (53.40 q ha-1) and net return of ¹ 20,492 ha-1 over control with highest benefit cost ratio (1.43) compared to the individual insecticidal treatments of flubendiamide 39.35EC @125ml ha-1with (1.16) and thiacloprid 240SC @625ml ha-1 with (1.19) benefit cost ratio. The overall performance of other pre mixed insecticides were found to be better than the performance of the individual insecticides.

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