Efficacy of selected insecticides and biopesticides against mustard aphid, Lipaphis erysimi (Kaltenbach) on Indian mustard (Brassica juncea L.) in Prayagraj (U.P)

Abstract

The field investigation was carried out in Rabi season of 2023-2024 at Central Research Farm (CRF), Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, Uttar Pradesh, India. The experiment was laid out in Randomised Block design (RBD) with eight treatments each replicated thrice using a variety, Kala Sona. The treatments viz., Imidacloprid 17.8 SL (0.2/l), Thiamethoxam 25 WG (0.2 g/l), Azadiractin 1500 ppm (1 ml/l), Fipronil 5 SC (1.6 ml/l), Beauveria Bassiana 1.15 Wp (2 g/l), Karanj oil 5% (5 ml/l), NSKE 5% (5 ml/l) and along with an untreated control were used against Lipaphis erysimi infesting mustard. The data on the mean (3rd, 7th and 14th DAS) Population over control on mustard aphid after spray revealed that all the chemical and biopesticides insecticide treatment were significantly superior over control. Among all the treatments, minimum infestation of aphid was recorded in Fipronil 5 SC (T4) (74.79) which was lower than the check treatment Imidacloprid 17.8 SL (61.647), followed by Thiamethoxam 25 WG (T2) (76.657), Azadiractin 1500 ppm (T3) (82.387), NSKE 5% (T7) (88.113), Karanj oil 5% (T6) (94.790), Beauveria bassiana 1.15 WP (T5) (99.567) and untreated (T8) (188.600). Among the treatments studied, Fipronil 5 SC give the highest cost benefit ratio (1: 5.07) and marketing yield (16.28 q/ha) which was lower than the check treatment Imidacloprid 17.8 S (1: 6.25 and 19.3 q/ha) followed by and Thiamethoxam 25 WG (1: 4.58 and 14.1 q/ha), Azadiractin 1500 ppm (1: 3.99 and 12.41 q/ha), NSKE 5% (1: 3.32 and 10.53 q/ha), Karanj oil (1: 2.84 and 8.9 q/ha), Beauveria bassiana 1.15 WP (1: 217 and 6.8 q/ha) and untreated (1:212 and 6.2 q/ha).