Reliable screening technique for resistance/susceptible traits against mustard aphid, Lipaphis erysimi (Kalt.) under field conditions

Twenty two varieties/lines of Indian mustard (Brassica juncea L.) were evaluated against mustard aphid, Lipaphis erysimi (Kalt.) NDR08-14-1 and NDR08-1 showed least aphid infestation index (0.7) and came under resistant category. NDYR-8, MCN14–33, MCN14–31, MCN14–24 and NDR1–11 with aphid infestation index (1.4) proved moderately resistant while, MCN14–23, MCN14–27, and NDR07-2 with aphid infestation index (1.75) were moderately susceptible. Six lines NDR8501, MCN14–32, NDR-7, MCN14–25, MCN14–29 and VARUNA were found susceptible (2.8 index). NDRS 2010, DIVYA-33, MCN 14–30, NDRS 9–2 and NDRS 2001-1 were found highly susceptible (4.26 index). The maximum yield was obtained from NDR08-14-1 (13.14 q/ha) and minimum yield from NDRS2001-1 (6.71 q/ha).