Lifetable study of fall army worm Spodoptera frugiperda (J. E. Smith) on maize Ashok K, Kennedy J S1, Geethalakshmi V2, Jeyakumar P3, Sathiah N, Balasubramani V* Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, 641003 1School of Post Graduate Studies, Tamil Nadu Agricultural University, Coimbatore, 641003 2Directorate of Crop Management, Tamil Nadu Agricultural University, Coimbatore, 641003 3Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, 641003 *Email: balasubramani.v@gmail.com (corresponding author)
Online published on 24 September, 2020. Abstract Biology and lifetable of Spodoptera frugiperda in maize were studied under controlled conditions of 27±1°C, 70±10%RH, 14L:10D. Adult longevity, oviposition period, fecundity and fertility of 30 pairs were evaluated. The total larval period was 14.48 days (I instar- 2.55 days, II instar- 2.12 days, III instar-2.08 days, IV instar- 2.00 days, V instar- 2.04 days, VI instar- 3.69 days), with a pupal period of 8.24 days and adult longevity of 12.6 days and 11.1 days for female and male, respectively. The net reproductive rate (Ro) was 480.33 (n=36) with a generation time (T) of 31.24 days. The determined intrinsic rate of natural increase (rm) and the finite rate of increase (λ) was 0.20 and 1.22 females/female/day, respectively. The population doubling time was found to be 3.51 days. Top Keywords Maize, S. frugiperda, Biology, Lifetable, Age specific, Stage specific, Generation time, Population doubling time, Intrinsic rate and finite rate of increase, Reproductive rate. Top |