HEMANT SWAMI*, LEKHA AND KULDEEP KUMAR

The experiment to evaluate the bioefficacy of Virtako 1.5 GR (Chlorantraniliprole 0.5% + Thiamethoxam 1%) at 5000, 6000 and 7000 g/ha along with Chlorantraniliprole 0.4 % GR at 8750 g/ha, Thiamethoxam 75% SG at 93.5 g/ha, Fipronil 80% WG at 75 g/ha and Dimethoate 30% EC at 667 ml/ha against pest complex of onion was conducted in Randomized Block Design with three replications at Horticulture farm, R.C.A., Udaipur during , 2017 and Rabi, 2018. The results reveal that all the treatments were significantly superior to untreated control. The highest mean reduction in the population of thrips was recorded in case of application of Virtako 1.5 GR (Chlorantraniliprole 0.5% + Thiamethoxam 1%) at 7000 g/ha which caused 69.45, 74.04, 83.93, 88.61 and 93.62 during , 2017 and 68.05, 73.03, 84.08, 88.12 and 92.20 per cent reduction in the mean population of thrips at 7, 14, 21, 28 and 35 days after application during 2018, respectively. It was followed by Virtako 1.5 GR (Chlorantraniliprole 0.5% + Thiamethoxam 1%) at 6000 g/ha which caused 64.51, 69.07, 80.03, 81.42 and 88.17 & 63.22, 68.78, 82.08, 81.68 and 87.01 per cent reduction in the population of thrips at 7, 14, 21, 28 and 35 days after application during 2017 & 2018, respectively and found at par with above treatment. The highest marketable yield of onion 172.28 and 178.60 q/ha was recorded in case of application of Virtako 1.5 GR (Chlorantraniliprole 0.5% + Thiamethoxam 1%) at 7000 g/ha during 2017 and 2018, respectively. It was found at par to spray of Virtako 1.5 GR (Chlorantraniliprole 0.5% + Thiamethoxam 1%) at 6000 g/ha which yielded 166.12 and 167.55 q/ha during 2017 and 2018, respectively.