اثرات زیر‌کشندگی کنه‌کش سایفلومتوفن بر پارامترهای زیستی کنه تارتن دولکه ای Tetranychus urticae (Koch) (Acari: Tetranychidae) روی خیار

The two spotts spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) is one of the most important cosmopolitan pests which have a vast range of host plants such as cucumber (Cucumis sativus L). The use of sublethal doses can cause reduction pesticide usage and prevent pest resistance that is important step in integrated pest management.Our study evaluated the sublethal effects of cyflumetofen (Danisaraba®) on life table parameters of two-spotted spider mite in different experimental concentrations including LC10, LC20, LC30 as well as control. The experiment were done under laboratory condition at 25 ± 2 °C, 60 ± 5 RH and a photoperiod of 16:8 (L:D) h. Data were analyzed based on two sex life table theory.The three sublethal concentrations were determined based on dose-response bioassay so that these levels were selected as 199 (177-218), 236 (216-253) and 267 (249-283) ppm, respectively.The results demonstrated that by increasing the experimental dose from LC10 to LC30, a significant decline was recorded in duration of biological maturation for both sexes of the two-spotted spider mite. Furthermore, in examining the total fecundity, it was found that at control, LC10, LC20 and LC30 treatments, the values were 60.24, 42.65, 35.54and 21.99eggs per day, respectively. The maximum and minimum values for the intrinsic rate of increase (r) were recorded to be 0.233 and 0.216 day-1 for the mites treated at control and LC30 concentrations, respectively .The net reproductive rate (R0) was decreased from 34.12 in LC10 to 16.70 offspring/individuals in LC30 concentration .The finite rate of increase (λ), reached maximal value (1.263 day-1) in control, whereas minimum value (1.241day-1) that was at LC30 concentration.The gross reproduction rate (GRR) was varied from 21.14 and 52.96 offspring/individual when treated by LC30 and distilled water a respectively. The recorded time period for the mean generation time (T), was readed to maximum value (13.01 days), when treated by the highest (LC30) concentration. to conclude the results that the sublethal concentrations of tested acaricide has significant effects on some important demographic parameters of T. urticae so these data can be useful in designing management programs (such as; R0, r, λ, GRR, T) for this pest.