author(s)
Sandhya Sinha, Abhishek Shukla and RB Yadav

abstract
The experiments were conducted in Randomized Block Design, during 2018-19 and 2019-20, to workout relative susceptibility of 45 mustard cultivars to aphids (Lipaphis erysimi Kalt.) on the basis of mean aphid index values, as per the methodology described by Patel et al., 1995 ^[10]. The mean aphid index values were subjected to analysis of variance at 5% level of significance to compare different cultivars. Cultivars Durgamani (0.23), RP-9 (0.27), Aravali (0.28), RVM-2 (0.29) and RH-406 (0.31) recorded lowest mean aphid index values (more than 0.18 but less than 0.34) and were categorized as resistant. Cultivars Geeta, Jaganath, RVM-3, DRMRIJ-31, RVM-1, JTC-1, Bhagirathi, PC-5, Maya, GSL-1, Gujarat mustard-2, Ashirwad, BR-40, JM-3, Gujarat mustard-1, IJ-31, Kiran, Kranti, SEJ-2, China Kovind, Jawahar mustard-2, Jawahar mustard-1, JM-2, Shradda, GSC-7, NRCHB-101, RH-749, RGN-73, Basanti, NRCDR-2 were found to be moderately resistant.