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1 February 2012 Effects of the Heavy Metal Cu2 on Growth, Development, and Population Dynamics of Spodoptera litura (Lepidoptera: Noctuidae)
Donglin Huang, Jie Kong, Yue Seng
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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.

© 2012 Entomological Society of America
Donglin Huang, Jie Kong, and Yue Seng "Effects of the Heavy Metal Cu2 on Growth, Development, and Population Dynamics of Spodoptera litura (Lepidoptera: Noctuidae)," Journal of Economic Entomology 105(1), 288-294, (1 February 2012).
Received: 18 May 2011; Accepted: 1 October 2011; Published: 1 February 2012

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