Biology of bean aphid, Aphis craccivora Koch on field bean

Abstract

Studies on the biology of aphid, Aphis craccivora Koch on field bean was carried out under laboratory condition at the Department of Agricultural Entomology, University of Agricultural and Horticultural Sciences, Navile, Shivamogga during 2017-2018. The results indicated that A. craccivora Koch passed through four nymphal instars. The average duration of first, second, third and fourth instar nymphs were 1.47 ± 0.37 days, 1.36 ± 0.47 days, 1.19±0.22 days and 1.41±0.39 days, respectively with total nymphal duration of 5.43±1.05 days. The average length of first, second, third and fourth instar nymphs were 0.54 ± 0.25 mm, 0.86±0.12 mm, 1.13±0.07 mm and 1.57±0.03 mm, respectively. The average longevity of adult was 10.65±0.66 days. Adults measured 2.25±0.08 mm in length and 1.16±0.08 mm in width. Average pre-reproduction, reproduction and post-reproduction period were 1.39±0.32 days, 9.4±0.77 days and 1.28±0.29 days, respectively. The total life span of Aphis craccivora was 17.66±2.37 days. The reproductive potential of the aphid was 29±4.34 nymphs per female.