Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Lifetable study of fall army worm Spodoptera frugiperda (J. E. Smith) on maize.

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.