author(s)
Nahid Vaez

abstract
To provide reliable information concerning reproductive potential of Encarsia formosa and its Host (Bemisia tabaci), their related life tables were studied under controlled laboratory conditions. The unprocessed data of life tables were analyzed taking the Euler-Lotka as the basic model. Standard error of population growth parameters was calculated using the Boot strap re-sampling method. The intrinsic rate of increase (r_m) of parasitoid was 0.09±0.0031day^-1. Other table parameters, including net reproductive rate (R₀), mean generation time (T), the finite rate of increase (λ) were estimated as 19.62±1.62 offsprings, 32.79±0.34 d, 1.08±0.0034 d^-1, respectively. These parameters were estimated for B. tabaci as: r_m= 0.12.±0.01 d^-1, R₀= 20.68±2.25 offspring, T = 27.22±0.28 d, λ = 1.11±0.0048 d^-1. A comparison of the two life table parameters showed that there are significant differences between life table parameters of E. formosa and those of B. tabaci. In all cases, B. tabaci exhibited a more prominent reproductive trait.