author(s)
SP Yadav, Balbir Singh, Satyajeet and Hemant Kumar

abstract
Field experiment on efficacy of eight insecticides was conducted at RRS, Bawal, Rewari (Haryana) against mustard aphid, Lipaphis erysimi on Indian mustard variety RB-50 during Rabi, 2017-18, 2018-19 and 2019-20. The spray of treatment T8: Diamethoate 30EC @ 625 ml/ha was proved most effective treatment with pooled mean aphid population of 4.36, 3.85 and 2.83 aphids/10 cm on main apical shoot as against 29.43, 37.37 and 44.77 aphids/10 cm on main apical shoot in the T9: control after 3, 7 and 10 days of spray, respectively. Succeeding treatments, T6: Neem oil @ 5% after clipping of infested twigs,T4: Beauveria bassiana @ 10⁸ cs/ml after clipping of infested twigs,T5:NSKE @ 5% after clipping of infested twigs,T2: Beauveria bassiana @ 10⁸ cs/ml, T3: Neem oil @ 5%, T1: NSKE @ 5% and T7: clipping of infested twigs at ETL with pooled mean aphid population of 5.95, 6.32, 7.28, 7.87, 8.43, 8.87 and 32.92 aphids/10 cm of main apical shoot after 10 days of spray, respectively. The maximum seed yield was found in treatment T8: Diamethoate 30 EC @ 625 ml/ha (16.80 q/ha) followed by T6: Neem oil @ 5% after clipping of infested twigs (15.45 q/ha) in comparison to T9: control (8.31 q/ha). Thus, spray of treatment Diamethoate 30 EC @625 ml/ha can be suggested for the management of mustard aphid.