اثرات زیر‌کشند‌گی بایومایت روی پارامتر‌های تولیدمثلی و رشدی جمعیت کنه شکارگر Neoseiulus californicus McGregor (Acari: Phytoseiidae)

An comperhension of the impact of pesticides on predatory mites is important for integrated pest management (IPM) programs. Nowadays the use of low selective pesticide concentrations is one of the suitable methods for pest management in order to prevent the destruction of the natural enemies population as well as the return of the population of two-spotted spider mites. The present study evaluated the sublethal effect of biomite (biomite®) in three concentration (LC5, LC10 and LC20) on life table parameters of Neoseiulus californicus (McGregor), an efficient natural enemy of Tetranychus urticae Koch (Acari: Tetranychidae). The lethal and sub-lethal concentrations in this study were calculated using bioassay experiments and leaf-dipping method. The experiments were conducted at laboratory condition of 25±2 ºC, 60±5 % RH, and a photoperiod of 16:8 (L:D) hr. The raw data were analyzed based on two-sex life table analysis. Based on the results of bioassay, the applied values for these concentrations were 8916, 9758, 10885 ppm, respectively. The results demonstrated that by increasing the dose from LC10 to LC20, a significant decline was recorded in duration of biological maturation for both sexes (male and female) of the predatory mite. The highest and lowest values of total fecundity were obtained at control (35.31 offspring/individual) and LC20 (22.48 offspring/individual) concentration, respectively. The intrinsic rate of increase (r) varied from 0.2061 to 0.2161 days-1 for mites treated with distilled water and LC20 concentrations, respectively. The finite rate of increase (λ)was varied from 1.235 day-1 for predatory mites treated by distilled water and 1.228 day-1 for LC20 treatment. The net reproduction rate (R0) of the female treated with LC20 (15.22 offspring/individual) concentration, significantly decreased than the females exposed to LC5 (21.86 offspring/individual) concentration. The maximum and minimum values of gross reproductive rate (GRR), was recorded 27.18 (offspring/individual) at control and 18.15 (offspring/individual) in LC20 dose. The recorded time period for the mean generation time (T), was variable from 14.74 days at control up to 13.27 days at LC20 concentrations. The highest and lowest the life span period of the female predatory mites, was 32.1 and 24.48 days which was belonged to control and LC20 treatments, respectively.Based on the obtained results, application of sublethal concentrations of biomite acaricide, has an impact on some biological parameters of predatory mite N. californicus, and the results of this work can be used to design the management plans for this pest.