Interaction of diferent rapeseed-mustard genotypes with mustard aphid Lipaphis erysimi (kaltenbach)

To study the effect of interaction of different genotypes of rapeseed-mustard with mustard aphid Lipaphis erysimi (Kaltenbach) experiments were conducted at Pulses and Oilseeds Research Station, Berhampore, West Bengal; India during rabi season of three consentive years i.e. 1992-93 1993-94 and 1994-95. It was observed that population of mustard aphid increased grudually from first standard week reaching its peak during sixth standard week irrespective of varieties. The variety RW white flower glossy stem harboured maximum number of aphids in comparison to other two varieties B-9 and T-6342. Interaction between years and weeks indicated that there was a differential response of aphid population in different weeks and years.