~ 1814 ~ Journal of Pharmacognosy and Phytochemistry 2018; SP1: 1814-1820 E-ISSN: 2278-4136 P-ISSN: 2349-8234 JPP 2018; SP1: 1814-1820 Pinkesh Ahlawat Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, (U.P), India Rajendra Singh Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, (U.P), India SP Singh Indian Institute of Farming Systems Research, Modipuram, Meerut, (U.P.), India SK Sachan Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, (U.P), India DV Singh Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, (U.P), India Spoorthi GS Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, (U.P), India MP Gautam Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, (U.P), India Correspondence Rajendra Singh Department of Entomology, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, (U.P), India Efficacy of bio pesticides and novel insecticides for control of Lipaphis erysimi (Kalt) on mustard crop in western U.P. Pinkesh Ahlawat, Rajendra Singh, SP Singh, SK Sachan, DV Singh, Spoorthi GS and MP Gautam Abstract The field experiment was conducted in randomized block design with three replications of eight treatments for a crop season of the year i.e. “ Rabi 2015-16 ” at entomological research block of crop research centre, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut - 250110 (U.P.), India. Different insecticides against L. erysimi revealed that all the insecticides were significantly effective in reducing the population of aphids and thus increasing the yield than control. Higher yield ranging between 15.55 to 18.15 q/ha and were proved significantly superior over control (14.17 q/ha). The highest seed yield of 18.15 q/ha was obtained from the imidacloprid 17.8 %SL @ 20 ml a.i/ha treated plot and it was significantly superior over rest of the treatments. Cost benefit ratio from the table that imidacloprid 17.8 %SL @ 20 ml a.i/ha ranked first indicating the maximum return Rs 1: 9.55 per rupee invested followed by dimethoate 30 %EC @ 300 ml a.i/ha, Thiamethoxam 25 % WDG @ 25 g a. i ha. Keywords: Efficacy, bio-pesticides, novel insecticides, mustard aphid Lipaphis erysimi. Introduction Mustard, Brassica juncea (Linnaeus), belongs to family cruciferae So that oilseed crops play an important role in agricultural economy of India. It constitutes the second largest agricultural product in the country next to food grains. India holds first position as a grower, producer, importer and exporter of vegetable oils in the world scenario, source of edible oil and vegetable for human as well as cakes for animals. Aurvedic Samhitas describes the use of ‘Sarson’ in India. In Sanskrit literature, ‘Sorson’ seeds have been described as antiseptic (Das, 1997). Rapeseed-mustard (Brassica spp.) are the major Rabi oilseed crops, grown over an area of 6.34 million hectare with a production of 7.82 million tones and productivity of 1234 kg/ha in 2012-13 in India (Thomas et al., 2014). Rajasthan is the largest mustard seed producing state in India accounting for over 45 per cent share in Indian mustard seed production followed by UP (15 per cent), M.P. (11 per cent). It also account for over 40 per cent of acreage. According to latest, data released from Department of Agriculture, Govt of Rajasthan, as on 2nd Nov, 2015, area under Rape & Mustard is pegged at 11.77 lakh hectares (lh) which is lower by 2.93 lh or 20 per cent lower compared to last years’ sowing data. In 2015 -16 Rabi season, Rajasthan has target to plant about 27 lakh hectares (lh) of Rape & Mustard. (Anonymous 2015-16) Among these, L. erysimi is one of the most destructive insect (Rai, 1976) It causes damage directly by sucking phloem from different parts of plant and indirectly as a vector of plant viruses. The attack is severe in those regions where the numbers of cloudy days are more during the pest activity period. On heavy infestation, aphids are largely congregated underside of leaves, they curling and yellowing them and plants fail to develop pods, if young pods develop do not produce healthy seeds and also resulting plant to loss their growth (Mamun et al., 2010). The yield loss in rapeseed-mustard also varies with their germplasms and agro-ecological practices (Ansari et al., 2007). Materials and Methods The present investigation on Efficacy of bio-pesticides and novel insecticides against mustard aphid, Lipaphis erysimi (Kalt.) in western U.P.” was carried out from Rabi 2015-16 in order to explore better developing management against this pest on aphid. The details field experiment was carried out during Rabi 2015-16 at Crop Research Centre (C.R.C), Chirauri farm, Sardar Vallabhbhai Patel University of Agriculture & Technology., Meerut (U.P.) India. Treatments T1 Spray of imidacloprid 17.8% SL @ 20 ml a.i/ha -1 , T2 Spray of acephate 75% SP @ 350