EVALUATION OF DIFFERENT GENOTYPES OF INDIAN MUSTARD (BRASSICA-JUNCEA) FOR THEIR REACTION TO MUSTARD APHID (LIPAPHIS-ERYSIMI)

An experiment was conducted during 1985-86 with Indian mustard [Brassica juncea (L.) Czemj. & Cosson; syn B. campestris L.] to evaluate their reactions to mustard aphid [Lipaphis erysimi (Kaltenbach] at different days after sowing in the field. The aphid infestation and population showed a rising trend from 45 days after sowing, reached the peak at 60 days and thereafter tended to decline. In the net-house maximum aphid density (362.00, 400.00 and 288.67, 308.00) was observed in 'M 121-4' and 'Tori 7' at both sixth leaf and flowering stages of the crop. On the basis of percentage of infestation, aphid abundance/plant, seed yield and net-house observations, the mustard genotypes could be graded in the descending order of susceptibility: 'Tori 7', 'M 121-4', 'M 38-3', 'Kallyania', 'M 26E 6-3', 'SS 75', 'M 25E 1-2', 'Sampad', 'YS 67' and 'M 211'.