Vol. 7, Issue 2 (2019)

The investigations were carried out at Agronomy Instructional Farm, C. P. College of Agriculture, S. D. Agricultural University, Sardarkrushinagar during kharif, 2017 on field efficacy of newer insecticides against stem borer, Chilo partellus (Swinhoe) infesting maize under field condition.

Among all seed treatment and application of insecticides, leaf whorl application of Carbofuran 3G @ 10 kg/ha at 20 and 35 days after sowing found superior as, it recorded only 15.80 per cent damaged plant which was found at par with seed treated with thiamethoxam 30 FS @ 8 ml/kg seed + foliar spray of spinosad 45 SC @ 0.0054 per cent at (18.21 %) and seed treated with imidacloprid 600 FS @ 10 ml/kg seed + foliar spray of spinosad 45 SC @ 0.0054 per cent recorded 20.29 per cent damaged plant by C. partellus. On other hand, higher per cent damaged plant due to C. partellus was noticed in untreated plot (33.77 %). Leaf whorl application of Carbofuran 3G @ 10 kg/ha, recorded only 1.96 leaf injury scale which was found at par with thiamethoxam 30 FS @ 8 ml/kg seed + spinosad 45 SC @ 0.0054 per cent (2.1) and imidacloprid 600 FS @ 10 ml/kg seed + spinosad 45 SC @ 0.0054 per cent recorded 2.37 leaf injury scale recorded at 15 day after second spray. Lowest (1.60 %) stem tunneling was observed in the plots treated with leaf whorl application of carbofuran 3 G @ 10 kg/ha and it was at par with treatment thiamethoxam 30 FS @ 8 ml/kg seed + spinosad 45 SC @ 0.0054 per cent (2.02 %) and imidacloprid 600 FS @ 10 ml/kg seed + spinosad 45 SC @ 0.0054 per cent (2.03 %). On the other hand, control plots harboured highest (4.00 %) stem tunneling percentage. Significantly the lowest (0.64 %) dead heart was observed in the plots treated with leaf whorl application of carbofuran 3G @ 10 kg/ha and it was followed by thiamethoxam 30 FS @ 8 ml/kg seed + spinosad 45 SC @ 0.0054 per cent (1.28 %) and imidacloprid 600 FS @ 10 ml/kg seed + spinosad 45 SC @ 0.0054 per cent (1.28 %). Whorl and spray applications of insecticides were superior over untreated plot as well as seed treatment in reducing per cent dead heart.