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

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 25 ± 1• C, 60 ± 5% relative humidity and a photoperiod of 16 h light/8 h dark. The highest and lowest net fecundity rates were obtained on Williams (244.1 ± 19.4 eggs/female) and L17 (80.5 ± 6.9 eggs/female), respectively. The net reproductive rates (R o ) were highest on Williams (137.0 ± 11.2 females/female/generation) and lowest on BP (41.3 ± 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 32.0 ± 0.3 days (on L17) to 28.8 ± 0.3 days (on Sahar). The results are discussed with respect to the potential effect of soybean cultivars on the performance of S. exigua.

Vitellogenin and vitellogenin receptor gene expression profiles in Spodoptera exigua are related to host plant suitability

“…There were no marked differences in key life history parameters of S. exigua reared on the different lettuce cultivars, including the intrinsic rate of increase and fecundity. This is not consistent with previous reports assessing the effects of different cultivars of soybean, corn and canola on population parameters of S. exigua ; indeed, some cultivars of the above host plants were shown to have higher nutritional values for S. exigua performance. This discrepancy might be attributable to the species of host plant tested as well as to the limited number of cultivars used in this study.…”

“…The nutritional quality of plants, i.e. their contents of primary and secondary metabolites, may considerably alter the biology and ecology of herbivores . SeVg and SeVgR expression levels were higher in S. exigua reared on plants with good nutritional quality such as lettuce, and lower on tomato and celery, which contain abundant secondary metabolites such as α‐tomatine and flavonoids, which are toxic to several insects.…”

“…Different hosts play critical roles in population increases and outbreaks of polyphagous insects as their life history traits are affected by changes in host properties . For instance, a host plant containing deleterious compounds may reduce the weight and/or body size of herbivorous insects, consequently altering multiple parameters, for example increasing development time and reducing fecundity and survival .…”

Evaluation of indigenous the nucleopolyhedrovirus (NPV) of Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae) in combination with chlorantraniliprole against Spodoptera species

“…Spodoptera exigua (Hübner) and S. litura (Fabricius) (Lepidoptera: Noctuidae) are native to Asia (Farahani et al 2012). Both attack more than 90 plant species including major crops such as sugar beet, cotton, soybean, and potatoes (Fu et al 2017;Luna-Espino et al 2018).…”

The Relationship of the Population Density of Larvae Spodoptera litura with the Leaf Damage and Decrease of Seed Yield for Soybean, Indonesia

“…In addition to physical factors, the biochemical factors contained in the leaves of plants will influence the interest of larvae to eat. According to Farahani et al [15], a decisive factor for a host whether it will be susceptible or resistant depends on the nutrients, biochemical, phytochemicals and secondary substrate. Furthermore, it is noted that from four observed varieties (Williams, BP, Sahar, JK and L 17), Williams is the most preferred variety by the armyworm so that the generation phase of the armyworm larvae becomes shorter and higher on its fertility rate.…”