پارامترهای زیستی کنه تارتن دو لکه ای Tetranychus urticae (Acari: Tetranychidae) و شکارگر آن Amblyseius swirskii (Acari: Phytoseiidae) پرورش یافته روی دو رقم خیار

The life table parameters are powerful methods for analyzing and understanding the impact of an external factor like host plant quality on growth, survival rate, reproduction, and increased rate of a biocontrol agent population. In this study, two-sex life table parameters of Tetranychus uticae Koch and its predator Amblyseius swirskii Athias-Henriot were determined on susceptible (Beta Alpha) and resistant (HED) cucumber cultivars under laboratory conditions at (25±1 ºC, 65±5% RH and a photoperiod of 16 L:8D h). The means, variances, and standard errors of the life table parameters were estimated using the bootstrap re-sampling procedure. The value of the intrinsic rate of increase (rm) of T. urticae on the susceptible cucumber cultivar (0.2093d-1) was significantly higher than that on the resistant one (0. 1715d-1). The value of the net reproductive rate (R0) on the susceptible and resistant cucumber cultivars was 20.18 and 14.81 offspring, respectively. The mean generation time (T) on the resistant cucumber cultivar (15.71 day) was significantly higher than that on the susceptible one (14.35 day). In addition, the result of life table parameters of A. swirskii on T. urticae reared on susceptible and resistant cucumber cultivars showed there was no significant difference between the values of the intrinsic rate of increase (rm) and the net reproductive rate (R0) of A. swirskii on two cultivars and the values of rm and R0 on the susceptible and resistant cultivars was 0.1434d and 0.1349 d-1, 13.8, 13.66 offspring, respectively. The obtained results showed that two-spotted spider mites reared on two cucumber cultivars had no effect on life table parameters of A. swirskii.