Int.J.Curr.Microbiol.App.Sci (2019) 8(6): 2020-2025 2020 Original Research Article https://doi.org/10.20546/ijcmas.2019.806.240 Assessment of Avoidable Yield Losses Due to Lipaphis erysimi Kalt in Various Brassica spp. Deepak Sharma 1* , S.P. Yadav 2 and Sunita Yadav 3 1 Department of Entomology, CCS Haryana Agricultural University, Hisar-125004 (Haryana), India 2 Regional Research Station, CCS Haryana Agricultural University, Rohtak-124004 (Haryana), India *Corresponding author ABSTRACT Introduction The oilseed Brassica species are, Indian mustard (B. juncea (L.) Czern. & Coss.), toria (B. rapa L. var. toria), yellow sarson (B. rapa L. var. yellow sarson), brown sarson (B. rapa L. var. brown sarson), gobhisarson (B. napus L.), karanrai (B. carinata Braun.) and taramira (Eruca sativa Mill.). These species belongs to the genus Brassica and family Brassicaceae and are called rapeseed-mustard in vernacularly language and are traditionally grown as the major groups of winter oilseed crops under irrigated and natural rainfall areas of India. India is one of the largest rapeseed mustard growing country in the world, occupying the first position in area and second position in production after China (Khavse et al., 2014). India accounts for 19.29 per cent and 11.13 per cent of the total acreage and production of rapeseed-mustard in the world, respectively (Anonymous, 2013). Among the seven edible oilseeds cultivated in India, rapeseed-mustard International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 8 Number 06 (2019) Journal homepage: http://www.ijcmas.com Present field studies were conducted during the Rabi season of year 2015-16 at Regional Research Station, Rohtak (Haryana), India, to assess the yield losses due to mustard aphid in various Brassica spp. (B. juncea, B.napus and B. rapa) sown under early and late sown conditions. The avoidable losses in terms of seed yield varied from 9.26 to 17.48 per cent, found lowest (9.26%) in HNS 0901 whereas, highest (17.48%) in BSH 1 under timely sown conditions. These losses ranged from 20.11 to 32.62 per cent under late sown conditions, found lowest (20.11%) in HNS 0901 although highest (32.62%) in BSH 1. The avoidable oil content losses in all three Brassica spp. were ranged from 3.38 to 6.34 per cent, found lowest (3.38%) in RH 0749 however, highest (6.34%) in BSH 1 under timely sown conditions. These losses in oil content varied from 4.92 to 8.14 per cent, found lowest (4.92%) in RH 0749 however, highest (8.14%) in BSH 1 under late sown conditions. Germination percentage was not significantly affected by the mustard aphid in all three Brassica species. Keywords Aphid, Brassica, yield, losses, oil content Accepted: 15 May 2019 Available Online: 10 June 2019 Article Info