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Effects of the Heavy Metal Cu2+ on Growth, Development, and Population Dynamics of Spodoptera litura (Lepidoptera: Noctuidae)

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Abstract:

Spodoptera litura (F.) larvae were fed with artificial food containing four different concentrations of copper (25, 50, 100, and 200 mg/kg). Copper affected growth, development, and population dynamics of late instar larvae. Our results indicate that the fourth and fifth instar survival rates were significantly reduced at 50‐200 mg/kg copper (Cu2+). Moreover, all the Cu2+ treatments significantly reduced pupation and moth emergence rates in a dose-dependent manner. Larvae fed 25 or 50 mg/kg Cu2+ showed significant reductions in development period compared with non-Cu controls, and the pupation duration of animals fed 200 mg/kg was significantly longer than in non-Cu controls. All Cu2+ concentrations significantly reduced individual pupal weights compared with controls. In addition, Cu2+ at some concentrations significantly affected fertility parameters, such as doubling population time (DT), the net reproduction rate (R0 ), the mean generation time (T), the intrinsic rate of increase (rm ), and the finite increase rate (λ). Our study demonstrates that low concentrations of Cu2+ in the diet (25 and 50 mg/kg) shorten the generation time by 4‐5 d, whereas higher Cu2+ concentrations (100 and 200 mg/kg) increase DT for 1‐2 d.

Keywords: Spodoptera litura; copper; development; population dynamics

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/EC11163

Publication date: February 1, 2012

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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