Population dynamics of mustard aphid, Lipaphis erysimi Kalt. And their correlation with abiotic factors in different varieties of Indian mustard, Brassica juncea L.

Abstract

The aphid population appeared in first week of January at the flowering stage, which peaked during 7th standard week (Feb., 12-18) 115.5-155.0, 98.01-121.0 and 75.5-108.6 aphids/plant on mustard variety Urvashi, Vardan, Varuna and Rohini, respectively, when meteorological conditions viz., maximum temperature was 23.8 0C and minimum temperature 8.8 0C with maximum relative humidity 85.0% and minimum 46.0% were prevailing during 2010-11 and 2011-12.