author(s)
Nanda Kishore M, Krishnamoorthy SV and Kuttalam S

abstract
Piperonyl butoxide (PBO) and Diethyl maleate (DEM) showed less synergism with chlorantraniliprole 18.5 SC and recorded suppression ratios (SRs) from 3.35 to 17.26 and 6.03 to 22.72 respectively. At 100 ppm PBO exhibited moderate synergism among spinosad 2.5 SC, emamectin benzoate 5 SG and quinalphos 25 EC and recorded SRs of 38.46, 25.93 and 41.96 respectively. DEM at 50 ppm with spinosad 2.5 SC, at 75 ppm with emamectin benzoate 5 SG, at 50 and 75 ppm with quinalphos 25 EC showed moderate synergism with SRs of 30.77, 26.92, 31.09 and 31.71 respectively. The Non edible oils Neem oil, Iluppai oil and pongamia oil recorded little synergism with chlorantraniliprole 18.5 SC and spinosad 2.5 SC. Neem oil exhibited moderate synergm with spin sad 2.5 SC and the SR ratio is 30.47 and low down the resistance per cent from 63.41 to 44.09. Similarly moderate synergism was observed in Lippi oil at 2000 ppm and pongamia oil at 3000 ppm with emamectin benzoate 5 SG and the suppression ratios recorded are 32.00 and 34.78 respectively. Chlorantraniliprole 18.5 SC and edible oils, gingelly oil at 3000 and 4000 ppm, cotton seed oil at 4000 ppm and sunflower oil at 3000 ppm exhibited moderate synergism and recorded SR of 27.60, 33.33 and 29.28 respectively. Gingelly oil at 1000 ppm 2000 ppm and at 3000 ppm recorded moderated level of synergism with spinosad 2.5 SC, quinalphos 25 EC and emamectin benzoate 5% SG, with suppression 26.11, 32.00 and 29.82.