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 (r_m), 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.