Lethal and sublethal impacts of cyflumetofen and bromopropylate on Tetranychus urticae Koch (Acari: Tetranychidae)

The control of the two-spotted spider mite, Tetranychus urticae Koch as one of the most important key pests in agriculture, is basically dependent on the use of pesticides. The lethal and sublethal impact of cyflumetofen (Danisaraba®) and bromopropylate (Neoron®) were assessed. LC50 values of cyflumetofen and bromopropylate were 2.77 and 8.95 μg a.i./mL, respectively. The sublethal effect of LC30 concentration of these acaricides was evaluated on life table parameters of the pest at 25 ± 2 °C, 65 ± 5% relative humidity and a photo-period of 16:8 (L/D). The obtained data were assessed by two-sex life table theory. Both acaricides had significant effects on T. urticae biological parameters such as growth time, survival rate, as well as fertility. The exposure of female mites to LC30 decreased net reproduction rate (R0), finite rate of increase (λ) and intrinsic rate of natural increase (r). The intrinsic rate of natural increase (r) in cyflumetofen and bromopropylate treatments and control group were 0.035, 0.045 and 0.21 female offspring/female/day, respectively. The results of this study revealed that the acaricides had sub-lethal impacts on life table parameters of T. urticae and might have an effect on the population growth and subsequently the plethora of future generations. The findings of this study can be used in T. urticae management programs.