Bionomics of aphid, Aphis gossypii (Glover) on cumin, Cuminum cyminum Linn. under laboratory conditions

Abstract

The study on bionomics was carried out in PG laboratory of Department of Entomology, College of Agriculture, Junagadh Agricultural University, Junagadh during 2019-20.The aphid nymphs were moulted four times before attaining the adult stage. Average body length, width, antennal length & cornicle length of first, second, third and fourth instar nymphs were 0.49 + 0.05, 0.25 + 0.02, 0.25 + 0.02 & 0.03 + 0.01 mm; 0.68 + 0.03, 0.36 + 0.03, 0.34 + 0.03 & 0.05 + 0.01 mm; 0.88 + 0.04, 0.46 + 0.03, 0.49 + 0.03 & 0.07 + 0.02 mm and 1.15 + 0.04, 0.60 + 0.04, 0.58 + 0.04 & 0.12 + 0.03 mm, respectively. Average body length, width, antennal length and cornicle length of adult aphid were 1.38 + 0.05, 0.69 + 0.03, 0.68 + 0.05 and 0.18+ 0.03 mm, respectively. The average developmental period of first, second, third and fourth nymphal instar nymphs were 1.44 + 0.50, 2.20 + 0.65, 2.50 + 0.51 and 1.50 + 0.51 days, respectively. The total nymphal duration was 7.63 + 1.29 days. The mean longevity of adult aphid was showed to be 10.09 + 1.30 days with an entire life span of 17.72 + 1.45 days. The pre-reproductive, reproductive and post-reproductive periods were recorded to be 1.31 + 0.47, 7.04 + 1.13 and 1.72 + 0.70 days, respectively. The fecundity was showed to be 26.5+ 6.77 nymphs per female and the intrinsic rate of single female per day was an average of 4.3 + 2.62 nymphs /day.