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Volume 2012 (2012), Article ID 513824, 7 pages
http://dx.doi.org/10.1155/2012/513824
Research Article

Life Table of Spodoptera exigua (Lepidoptera: Noctuidae) on Five Soybean Cultivars

Department of Agricultural Entomology, Faculty of Agriculture, Tarbiat Modares University, P.O. Box 14115-336, Tehran 1411713116, Iran

Received 27 October 2011; Accepted 27 December 2011

Academic Editor: G. B. Dunphy

Copyright © 2012 Samira Farahani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Effect of five soybean cultivars (Sahar, JK, BP, Williams, and L17) on life table parameters of the beet armyworm Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae) was evaluated at 2 5 ± 1 C, 6 0 ± 5 % relative humidity and a photoperiod of 16 h light/8 h dark. The highest and lowest net fecundity rates were obtained on Williams ( 2 4 4 . 1 ± 1 9 . 4 eggs/female) and L17 ( 8 0 . 5 ± 6 . 9 eggs/female), respectively. The net reproductive rates ( 𝑅 𝑜 ) were highest on Williams ( 1 3 7 . 0 ± 1 1 . 2 females/female/generation) and lowest on BP ( 4 1 . 3 ± 4 . 1 females/female/generation). The intrinsic rate of increase ( 𝑟 𝑚 ) differed significantly among five soybean cultivars, ranging from 0.1169 day−1 (on Williams) to 0.122 day−1 (on BP). The highest value of finite rate of increase ( 𝜆 ) was on Williams (1.18 day−1), which was significantly different from other cultivars. The mean generation time ( 𝑇 𝑐 ) was significantly different on various cultivars, ranging from 3 2 . 0 ± 0 . 3 days (on L17) to 2 8 . 8 ± 0 . 3 days (on Sahar). The results are discussed with respect to the potential effect of soybean cultivars on the performance of S. exigua.