author(s)
AS Ingle, VK Biradar, PA Wawdhane, Bhabani Mahankuda and KI Chaple

abstract
One hundred thirty eight mutants of mustard Pusa Bold variety were screened for their resistance to the mustard aphid, Lipaphis erysimi (Kalt.) under field condition during Rabi season 2016-17 at Research Farm of Agricultural Botany Section, College of Agriculture, Nagpur, Maharashtra, India. The screening was done based on the parameters of aphid infestation index and aphid population count. Results revealed that the aphid infestation indexranged from 0.78 (M₆₃ Pusa Bold 1100 gy) to 4.43 (M₃₅₁ Pusa Bold Control-2).Among all the observed mutants, 14 mutants were categorized as highly resistant (0.78 to 0.97 aphid infestation index), 22 mutants as resistant (1.15 to 1.95 aphid infestation index), 39 mutants as moderately resistant (2.19 to 2.87 aphid infestation index) and 63 mutants were categorized as susceptible (3.11 to 4.43 aphid infestation index). Highly resistant mutants may be used as doner parent in developing the cultivars resistant to mustard aphid.