THE SCREENING OF MUSTARD VARIETIES RESISTANCE AGAINST MUSTARD APHID Lipaphis erysimi Kalt

Aim: The screening of eight varieties of Indian mustard against aphid Lipaphis erysimi Kalt. Mustard aphid most destructive and serious pest cause damage to the crop by suck the sap appeared from germination till maturity of mustard its result reduction in yield, low oil content and viability of seed get affected.
Study Design: Experiment conducted in Randomized Block Design with three replication and eight treatments. The incidence of aphid start on eight varieties 8 WAS the peak period of aphid population third week of February, and maximum population found on the variety Varuna 285.7 aphid/10 cm top shoot portion and minimum population on the variety Rohini 110.5 aphids/10 cm apical shoot on the 3rd week of February. Overall maximum mean population of mustard aphid found on variety Varuna and minimum found on variety Rohini during 2013-14. The next year maximum population found on the second week of February on variety Varuna 281.3 aphids/10 cm apical shoot, and minimum found on variety Rohini 86.3 aphid/10 cm apical shoot on that week. Overall maximum mean population found on variety Varuna and minimum on variety Rohini during 2014-15.
Results: The experiment carried out by using parameter Aphid Infestation Index (AII) at full flowering stage and at full pod formation stage found varieties Varuna and Vaibhav susceptible to the aphid incidence and Vardan, Uravasi, Maya, Ashirvad and Pitambari were found moderately resistant to aphid and variety Rohini found resistant to the aphid incidence which may be used as a check experimental material for screening of varieties resistant to aphid during both year.